diff --git a/src/UnexpectedError.tsx b/src/UnexpectedError.tsx
index aa7f468..906d99d 100644
--- a/src/UnexpectedError.tsx
+++ b/src/UnexpectedError.tsx
@@ -18,7 +18,16 @@ const UnexpectedError: Component<{ error?: any }> = (props) => {
             .join("\n");
           return `${err.name}: ${err.message}\n${strackMsg}`;
         } catch (reason) {
-          return `<failed to build the stacktrace of "${err}"...>\n${reason}`;
+          return `<failed to build the stacktrace of "${err}"...>\n${reason}\n${JSON.stringify(
+            {
+              name: err.name,
+              stack: err.stack,
+              cause: err.cause,
+              message: err.message,
+            },
+            undefined,
+            2,
+          )}`;
         }
       }
 
diff --git a/src/masto/acct.ts b/src/masto/acct.ts
deleted file mode 100644
index ff9d488..0000000
--- a/src/masto/acct.ts
+++ /dev/null
@@ -1,28 +0,0 @@
-import { Accessor, createResource } from "solid-js";
-import type { mastodon } from "masto";
-import { useSessions } from "./clients";
-import { updateAcctInf } from "../accounts/stores";
-
-export function useSignedInProfiles() {
-  const sessions = useSessions();
-  const [accessor, tools] = createResource(sessions, async (all) => {
-    return Promise.all(
-      all.map(async (x, i) => ({ ...x, inf: await updateAcctInf(i) })),
-    );
-  });
-  return [
-    () => {
-      try {
-        const value = accessor();
-        if (value) {
-          return value;
-        }
-      } catch (reason) {
-        console.error("useSignedInProfiles: update acct info failed", reason);
-      }
-
-      return sessions().map((x) => ({ ...x, inf: x.account.inf }));
-    },
-    tools,
-  ] as const;
-}
diff --git a/src/masto/timelines.ts b/src/masto/timelines.ts
index 1aaefb1..6e5eb9b 100644
--- a/src/masto/timelines.ts
+++ b/src/masto/timelines.ts
@@ -26,7 +26,9 @@ export function createTimelineControlsForArray(
   const [threads, setThreads] = createStore([] as mastodon.v1.Status["id"][]);
 
   createEffect(() => {
-    const nls = status();
+    const nls = catchError(status, (e) => {
+      console.error(e);
+    });
     if (!nls) return;
 
     setThreads([]);
@@ -226,9 +228,7 @@ export type TimelineControls = {
   set(id: string, value: mastodon.v1.Status): void;
 };
 
-export type TimelineResource<
-  R,
-> = [
+export type TimelineResource<R> = [
   TimelineControls,
   Resource<R>,
   { refetch(info?: TimelineFetchDirection): void },
@@ -238,7 +238,7 @@ export type TimelineResource<
  * Create auto managed timeline controls.
  *
  * The error from the resource is not thrown in the
- * {@link TimelineControls.list} and {@link TimelineControls}.get*.
+ * {@link TimelineControls["list"]} and {@link TimelineControls}.get*.
  * Use the second value from {@link TimelineResource} to catch the error.
  */
 export function createTimeline<
diff --git a/src/material/BottomSheet.tsx b/src/material/BottomSheet.tsx
index 2ebed75..8a1dd62 100644
--- a/src/material/BottomSheet.tsx
+++ b/src/material/BottomSheet.tsx
@@ -228,6 +228,8 @@ const BottomSheet: ParentComponent<BottomSheetProps> = (props) => {
       }}
       onClick={onDialogClick}
       ref={element!}
+      tabIndex={-1}
+      role="presentation"
     >
       {ochildren() ?? cache()}
     </dialog>
diff --git a/src/material/Menu.css b/src/material/Menu.css
index 5c88653..1837db3 100644
--- a/src/material/Menu.css
+++ b/src/material/Menu.css
@@ -23,6 +23,11 @@
   &.e4 {
     box-shadow: var(--tutu-shadow-e12);
   }
+
+  &>.container {
+    background: var(--tutu-color-surface);
+    display: contents;
+  }
 }
 
 dialog.Menu::backdrop {
diff --git a/src/material/Menu.tsx b/src/material/Menu.tsx
index 916fc76..44628f9 100644
--- a/src/material/Menu.tsx
+++ b/src/material/Menu.tsx
@@ -3,6 +3,7 @@ import { MenuList } from "@suid/material";
 import {
   createEffect,
   createSignal,
+  splitProps,
   type Component,
   type JSX,
   type ParentProps,
@@ -16,11 +17,15 @@ import {
 
 export type Anchor = Pick<DOMRect, "top" | "left" | "right"> & { e?: number };
 
-export type MenuProps = ParentProps<{
-  open?: boolean;
-  onClose?: JSX.EventHandlerUnion<HTMLDialogElement, Event>;
-  anchor: () => Anchor;
-}>;
+export type MenuProps = ParentProps<
+  {
+    open?: boolean;
+    onClose?: JSX.EventHandlerUnion<HTMLDialogElement, Event>;
+    anchor: () => Anchor;
+
+    id?: string;
+  } & JSX.AriaAttributes
+>;
 
 function px(n?: number) {
   if (n) {
@@ -74,6 +79,7 @@ export function createManagedMenuState() {
 const Menu: Component<MenuProps> = (props) => {
   let root: HTMLDialogElement;
   const windowSize = useWindowSize();
+  const [, rest] = splitProps(props, ["open", "onClose", "anchor"]);
 
   const [anchorPos, setAnchorPos] = createSignal<{
     left?: number;
@@ -83,15 +89,16 @@ const Menu: Component<MenuProps> = (props) => {
 
   if (import.meta.env.DEV) {
     createEffect(() => {
-      switch (anchorPos().e) {
-        case 1:
-        case 2:
-        case 3:
-        case 3:
-          return;
-        default:
-          console.warn('value %s is invalid for param "e"', anchorPos().e);
-      }
+      if (anchorPos().e)
+        switch (anchorPos().e) {
+          case 1:
+          case 2:
+          case 3:
+          case 4:
+            return;
+          default:
+            console.warn('value %s is invalid for param "e"', anchorPos().e);
+        }
     });
   }
 
@@ -202,12 +209,13 @@ const Menu: Component<MenuProps> = (props) => {
         top: px(anchorPos().top),
         /* FIXME: the content may be overflow */
       }}
+      role="presentation"
+      tabIndex={-1}
+      {...rest}
     >
       <div
-        style={{
-          background: "var(--tutu-color-surface)",
-          display: "contents"
-        }}
+        class="container"
+        role="presentation"
       >
         <MenuList>{props.children}</MenuList>
       </div>
diff --git a/src/material/Scaffold.tsx b/src/material/Scaffold.tsx
index fa9631f..693793f 100644
--- a/src/material/Scaffold.tsx
+++ b/src/material/Scaffold.tsx
@@ -36,12 +36,12 @@ const Scaffold: Component<ScaffoldProps> = (props) => {
   return (
     <>
       <Show when={props.topbar}>
-        <div class="Scaffold__topbar" ref={setTopbarElement}>
+        <div class="Scaffold__topbar" ref={setTopbarElement} role="presentation">
           {props.topbar}
         </div>
       </Show>
       <Show when={props.fab}>
-        <div class="Scaffold__fab-dock">{props.fab}</div>
+        <div class="Scaffold__fab-dock" role="presentation">{props.fab}</div>
       </Show>
       <div
         ref={(e) => {
@@ -61,7 +61,7 @@ const Scaffold: Component<ScaffoldProps> = (props) => {
         {managed.children}
       </div>
       <Show when={props.bottom}>
-        <div class="Scaffold__bottom-dock">{props.bottom}</div>
+        <div class="Scaffold__bottom-dock" role="presentation">{props.bottom}</div>
       </Show>
     </>
   );
diff --git a/src/profiles/Profile.tsx b/src/profiles/Profile.tsx
index f3a5823..4e8a930 100644
--- a/src/profiles/Profile.tsx
+++ b/src/profiles/Profile.tsx
@@ -10,12 +10,14 @@ import {
   onCleanup,
   Show,
   type Component,
+  createMemo,
 } from "solid-js";
 import Scaffold from "../material/Scaffold";
 import {
   AppBar,
   Avatar,
   Button,
+  Checkbox,
   CircularProgress,
   Divider,
   IconButton,
@@ -66,6 +68,8 @@ const Profile: Component = () => {
   const time = createTimeSource();
 
   const menuButId = createUniqueId();
+  const recentTootListId = createUniqueId();
+  const optMenuId = createUniqueId();
 
   const [menuOpen, setMenuOpen] = createSignal(false);
 
@@ -87,17 +91,20 @@ const Profile: Component = () => {
   );
   onCleanup(() => obx.disconnect());
 
-  const [profileErrorUncaught] = createResource(
+  const [profileUncaught] = createResource(
     () => [session().client, params.id] as const,
     async ([client, id]) => {
       return await client.v1.accounts.$select(id).fetch();
     },
   );
 
-  const profile = () =>
-    catchError(profileErrorUncaught, (err) => {
-      console.error(err);
-    });
+  const profile = () => {
+    try {
+      return profileUncaught();
+    } catch (reason) {
+      console.error(reason);
+    }
+  };
 
   const isCurrentSessionProfile = () => {
     return session().account?.inf?.url === profile()?.url;
@@ -126,6 +133,22 @@ const Profile: Component = () => {
     },
   );
 
+  const [relationshipUncaught, { mutate: mutateRelationship }] = createResource(
+    () => [session(), params.id] as const,
+    async ([sess, id]) => {
+      if (!sess.account) return; // No account, no relation
+      const relations = await session().client.v1.accounts.relationships.fetch({
+        id: [id],
+      });
+      return relations.length > 0 ? relations[0] : undefined;
+    },
+  );
+
+  const relationship = () =>
+    catchError(relationshipUncaught, (reason) => {
+      console.error(reason);
+    });
+
   const bannerImg = () => profile()?.header;
   const avatarImg = () => profile()?.avatar;
   const displayName = () =>
@@ -137,10 +160,38 @@ const Profile: Component = () => {
     recentTootChunk.loading ||
     (recentTootFilter().pinned && pinnedTootChunk.loading);
 
+  const sessionDisplayName = createMemo(() =>
+    resolveCustomEmoji(
+      session().account?.inf?.displayName || "",
+      session().account?.inf?.emojis ?? [],
+    ),
+  );
+
+  const useSessionDisplayName = (e: HTMLElement) => {
+    createRenderEffect(() => (e.innerHTML = sessionDisplayName()));
+  };
+
+  const toggleSubscribeHome = async () => {
+    const client = session().client;
+    if (!session().account) return;
+    const isSubscribed = relationship()?.following ?? false;
+    mutateRelationship((x) => Object.assign({ following: !isSubscribed }, x));
+    subscribeMenuState.onClose();
+
+    if (isSubscribed) {
+      const nrel = await client.v1.accounts.$select(params.id).unfollow();
+      mutateRelationship(nrel);
+    } else {
+      const nrel = await client.v1.accounts.$select(params.id).follow();
+      mutateRelationship(nrel);
+    }
+  };
+
   return (
     <Scaffold
       topbar={
         <AppBar
+          role="navigation"
           position="static"
           color={scrolledPastBanner() ? "primary" : "transparent"}
           elevation={scrolledPastBanner() ? undefined : 0}
@@ -174,8 +225,10 @@ const Profile: Component = () => {
 
             <IconButton
               id={menuButId}
+              aria-controls={optMenuId}
               color="inherit"
               onClick={[setMenuOpen, true]}
+              aria-label="Open Options for the Profile"
             >
               <MoreVert />
             </IconButton>
@@ -185,12 +238,25 @@ const Profile: Component = () => {
       class="Profile"
     >
       <Menu
+        id={optMenuId}
         open={menuOpen()}
         onClose={[setMenuOpen, false]}
         anchor={() =>
           document.getElementById(menuButId)!.getBoundingClientRect()
         }
+        aria-label="Options for the Profile"
       >
+        <Show when={session().account}>
+          <MenuItem>
+            <ListItemAvatar>
+              <Avatar src={session().account?.inf?.avatar} />
+            </ListItemAvatar>
+            <ListItemText secondary={"Default account"}>
+              <span ref={useSessionDisplayName}></span>
+            </ListItemText>
+            {/* <ArrowRight /> // for future */}
+          </MenuItem>
+        </Show>
         <Show when={session().account && profile()}>
           <Show
             when={isCurrentSessionProfile()}
@@ -273,6 +339,7 @@ const Profile: Component = () => {
           "margin-top":
             "calc(-1 * (var(--scaffold-topbar-height) + var(--safe-area-inset-top)))",
         }}
+        role="presentation"
       >
         <img
           ref={(e) => obx.observe(e)}
@@ -283,7 +350,8 @@ const Profile: Component = () => {
             height: "100%",
           }}
           crossOrigin="anonymous"
-          onLoad={async (event) => {
+          alt={`Banner image for ${profile()?.displayName || "the user"}`}
+          onLoad={(event) => {
             const ins = new FastAverageColor();
             const colors = ins.getColor(event.currentTarget);
             setBannerSampledColors({
@@ -296,23 +364,21 @@ const Profile: Component = () => {
       </div>
 
       <Menu {...subscribeMenuState}>
-        <MenuItem disabled>
+        <MenuItem
+          onClick={toggleSubscribeHome}
+          aria-details="Subscribe or Unsubscribe this account on your home timeline"
+        >
           <ListItemAvatar>
             <Avatar src={session().account?.inf?.avatar}></Avatar>
           </ListItemAvatar>
-          <ListItemText>
-            <span
-              ref={(e) =>
-                createRenderEffect(() => {
-                  e.innerHTML = resolveCustomEmoji(
-                    session().account?.inf?.displayName || "",
-                    session().account?.inf?.emojis ?? [],
-                  );
-                })
-              }
-            ></span>
+          <ListItemText
+            secondary={relationship()?.following ? "Subscribed" : undefined}
+          >
+            <span ref={useSessionDisplayName}></span>
             <span>'s Home</span>
           </ListItemText>
+
+          <Checkbox checked={relationship()?.following ?? false} />
         </MenuItem>
       </Menu>
 
@@ -323,9 +389,10 @@ const Profile: Component = () => {
           color: bannerSampledColors()?.text,
         }}
       >
-        <div class="acct-grp">
+        <section class="acct-grp">
           <Avatar
             src={avatarImg()}
+            alt={`${profile()?.displayName || "the user"}'s avatar`}
             sx={{
               marginTop: "calc(-16px - 72px / 2)",
               width: "72px",
@@ -337,12 +404,19 @@ const Profile: Component = () => {
               ref={(e) =>
                 createRenderEffect(() => (e.innerHTML = displayName()))
               }
+              aria-label="Display name"
             ></span>
-            <span>{fullUsername()}</span>
+            <span aria-label="Complete username">{fullUsername()}</span>
           </div>
           <div>
             <Switch>
-              <Match when={!session().account || profileErrorUncaught.loading}>
+              <Match
+                when={
+                  !session().account ||
+                  profileUncaught.loading ||
+                  profileUncaught.error
+                }
+              >
                 {<></>}
               </Match>
               <Match when={isCurrentSessionProfile()}>
@@ -360,20 +434,24 @@ const Profile: Component = () => {
                     );
                   }}
                 >
-                  Subscribe
+                  {relationship()?.following ? "Subscribed" : "Subscribe"}
                 </Button>
               </Match>
             </Switch>
           </div>
-        </div>
-        <div
+        </section>
+        <section
           class="description"
+          aria-label={`${profile()?.displayName || "the user"}'s description`}
           ref={(e) =>
             createRenderEffect(() => (e.innerHTML = description() || ""))
           }
-        ></div>
+        ></section>
 
-        <table class="acct-fields">
+        <table
+          class="acct-fields"
+          aria-label={`${profile()?.displayName || "the user"}'s fields`}
+        >
           <tbody>
             <For each={profile()?.fields ?? []}>
               {(item, index) => {
@@ -422,6 +500,7 @@ const Profile: Component = () => {
           <Divider />
         </Show>
         <TootList
+          id={recentTootListId}
           threads={recentToots.list}
           onUnknownThread={recentToots.getPath}
           onChangeToot={recentToots.set}
@@ -437,6 +516,7 @@ const Profile: Component = () => {
         >
           <IconButton
             aria-label="Load More"
+            aria-controls={recentTootListId}
             size="large"
             color="primary"
             onClick={[refetchRecentToots, "prev"]}
diff --git a/src/settings/Settings.tsx b/src/settings/Settings.tsx
index 0bb04d7..dd82f25 100644
--- a/src/settings/Settings.tsx
+++ b/src/settings/Settings.tsx
@@ -31,12 +31,10 @@ import {
 import { A, useNavigate } from "@solidjs/router";
 import { Title } from "../material/typography.jsx";
 import { css } from "solid-styled";
-import { useSignedInProfiles } from "../masto/acct.js";
 import { signOut, type Account } from "../accounts/stores.js";
 import { format } from "date-fns";
 import { useStore } from "@nanostores/solid";
 import { $settings } from "./stores.js";
-import { useRegisterSW } from "virtual:pwa-register/solid";
 import {
   autoMatchLangTag,
   autoMatchRegion,
@@ -46,6 +44,7 @@ import {
 import { type Template } from "@solid-primitives/i18n";
 import BottomSheet from "../material/BottomSheet.jsx";
 import { useServiceWorker } from "../platform/host.js";
+import { useSessions } from "../masto/clients.js";
 
 type Strings = {
   ["lang.auto"]: Template<{ detected: string }>;
@@ -64,7 +63,7 @@ const Settings: ParentComponent = (props) => {
   const { needRefresh, offlineReady } = useServiceWorker();
   const dateFnLocale = useDateFnLocale();
 
-  const [profiles] = useSignedInProfiles();
+  const profiles = useSessions();
 
   const doSignOut = (acct: Account) => {
     signOut((a) => a.site === acct.site && a.accessToken === acct.accessToken);
@@ -118,9 +117,9 @@ const Settings: ParentComponent = (props) => {
             <Divider />
           </ul>
           <For each={profiles()}>
-            {({ account: acct, inf }) => (
-              <ul data-site={acct.site} data-username={inf?.username}>
-                <ListSubheader>{`@${inf?.username ?? "..."}@${new URL(acct.site).host}`}</ListSubheader>
+            {({ account: acct }) => (
+              <ul data-site={acct.site} data-username={acct.inf?.username}>
+                <ListSubheader>{`@${acct.inf?.username ?? "..."}@${new URL(acct.site).host}`}</ListSubheader>
                 <ListItemButton disabled>
                   <ListItemText>{t("Notifications")}</ListItemText>
                   <ListItemSecondaryAction>
diff --git a/src/timelines/Home.tsx b/src/timelines/Home.tsx
index f60eb35..99045bf 100644
--- a/src/timelines/Home.tsx
+++ b/src/timelines/Home.tsx
@@ -30,10 +30,10 @@ import { $settings } from "../settings/stores";
 import { useStore } from "@nanostores/solid";
 import { HeroSourceProvider, type HeroSource } from "../platform/anim";
 import { useNavigate } from "@solidjs/router";
-import { useSignedInProfiles } from "../masto/acct";
 import { setCache as setTootBottomSheetCache } from "./TootBottomSheet";
 import TrendTimelinePanel from "./TrendTimelinePanel";
 import TimelinePanel from "./TimelinePanel";
+import { useSessions } from "../masto/clients";
 
 const Home: ParentComponent = (props) => {
   let panelList: HTMLDivElement;
@@ -42,11 +42,11 @@ const Home: ParentComponent = (props) => {
 
   const settings$ = useStore($settings);
 
-  const [profiles] = useSignedInProfiles();
+  const profiles = useSessions();
   const profile = () => {
     const all = profiles();
     if (all.length > 0) {
-      return all[0].inf;
+      return all[0].account.inf;
     }
   };
   const client = () => {
diff --git a/src/timelines/TootList.tsx b/src/timelines/TootList.tsx
index 6145b75..da3f065 100644
--- a/src/timelines/TootList.tsx
+++ b/src/timelines/TootList.tsx
@@ -18,6 +18,7 @@ import { findElementActionable } from "./RegularToot";
 
 const TootList: Component<{
   ref?: Ref<HTMLDivElement>;
+  id?: string;
   threads: readonly string[];
   onUnknownThread: (id: string) => { value: mastodon.v1.Status }[] | undefined;
   onChangeToot: (id: string, value: mastodon.v1.Status) => void;
@@ -149,7 +150,7 @@ const TootList: Component<{
         return <p>Oops: {String(err)}</p>;
       }}
     >
-      <div ref={props.ref} class="toot-list">
+      <div ref={props.ref} id={props.id} class="toot-list">
         <For each={props.threads}>
           {(itemId, index) => {
             const path = props.onUnknownThread(itemId)!;