Usage in Bookmarks for Claude by kvachikk

Claude.ai shows how much of your usage limit you have left, but only if you go
looking for it. This extension puts that number on your bookmarks toolbar and
keeps it current, so you can see at a glance how much room is left before you
start a long session.

WHAT IT DOES

On first run it creates one bookmark on your bookmarks toolbar and renames that
bookmark on a timer. Your own bookmarks are never read, moved or modified — the
extension remembers the id of the one it made and touches nothing else. Clicking
that bookmark opens the Claude usage settings page; clicking the toolbar icon
forces an immediate refresh.

The toolbar icon also carries a badge with your current session percentage,
which turns amber at 70% and red at 90%.

WHAT YOU CAN CHANGE

Open Preferences to choose which limits appear and in what order — current
session, all models over seven days, Opus, Sonnet, connected apps, Cowork —
whether the session reset countdown is shown, and how often it refreshes,
from one to sixty minutes. A live preview shows the title your choices produce.

A limit your plan does not have is skipped rather than shown as zero.

PRIVACY

Nothing is collected and nothing is transmitted anywhere except claude.ai
itself. There is no server, no account, no analytics and no telemetry. Your
settings and the bookmark id are stored on your device with storage.local, and
deliberately not with storage.sync, so they never travel through a Mozilla
account.

The extension holds a host permission for claude.ai and nothing else, so it is
not technically able to contact another host. There is no content script, so it
runs on no web page at all.

HOW IT WORKS

It reads the same usage endpoint the Settings → Usage page in claude.ai reads,
authenticated by the login cookie already in your browser. Nothing is asked of
you: if you are signed in to claude.ai in this Firefox profile, it works.

That endpoint is unofficial and undocumented. If Anthropic changes it the
bookmark falls back to a dash rather than showing a stale number.

SOURCE

https://github.com/kvachikk/usage-in-bookmarks-for-claude

There is no build step. The code in the add-on is the code in the repository,
unminified and readable. A privacy check runs in CI on every commit and fails
the build if any network call, dynamic-code call, synced storage, sensor API,
analytics name, or URL outside claude.ai appears in the source.

Not affiliated with, endorsed by, or sponsored by Anthropic. "Claude" is a
trademark of Anthropic PBC, used here only to say what this extension works
with.