https://github.com/user-attachments/assets/e712dc61-70e2-48b0-b3cd-e2ac814c071e
Features
- Token count: approximate token count for the open chat, in a pill at the top left of the conversation, drawn like Gemini's own buttons. Click it for a table of each Gemini model's context window on each plan
- Usage bars: the 5-hour ("Hourly") and weekly limits from Gemini's own usage data, the same figures its usage page shows, with reset countdowns. They sit inside the input box, which grows to hold them. Bars turn amber at 75% and red at 90%. A thin line marks how far through the window you are, so you can see whether you are using your allowance faster than the clock
- Hover help: every control explains itself in a tooltip drawn as Gemini draws its own, and the icons are Gemini's own glyphs
- Chat export: download the open conversation as Markdown or plain text, including the documents Gemini wrote (Canvas, Deep Research reports) and the names of files you attached
- Toolbar popup: click the extension icon from any tab for your limits, with a switch for each part of the extension and a one-click bug report
- Every account: free and paid plans, and every signed-in Google account (
/u/0, /u/1, …), each with its own figures
The extension requests a single permission, storage. It runs on gemini.google.com and nowhere else, so that is the only site the browser lists it as able to access. The popup asks for its own access to gemini.google.com only if you press refresh there.
Screenshots
The toolbar popup: your limits from any tab, a switch for each part, and a prefilled bug report.
| Usage limits | Settings | Send feedback |
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Installation
Chromium (Chrome, Edge, Brave, Opera, Vivaldi, Arc, and any other Chromium-based browser; version 111 or later)
- Download or clone this repository.
- Open the browser's extensions page (
chrome://extensions on Chrome, brave://extensions on Brave, edge://extensions on Edge, or the equivalent for your browser) and turn on Developer mode.
- Click Load unpacked and pick the repository folder.
- Reload any Gemini tab that was already open: a tab open before install is not reached until it is reloaded.
Firefox is not supported.
How it works
The extension has two halves that run in two different JavaScript worlds, because the token Gemini's own requests carry is only visible to the page itself, not to a normal content script.
1. The page-world bridge (src/injected/bridge.js)
This script runs in the page's own execution context (the "main world"), not the isolated content script sandbox. The manifest declares it with "world": "MAIN" and "run_at": "document_start", so it is in place before Gemini's first script and keeps the browser's own fetch, not a wrapper Gemini adds later.
Gemini's web app talks to its server through one endpoint, /_/BardChatUi/data/batchexecute, with a named RPC per request and the page's CSRF token (WIZ_global_data.SNlM0e). The bridge makes two of those calls, the same ones Gemini's own pages make, and nothing else:
jSf9Qc: your usage limits, exactly what Gemini's usage page asks for.hNvQHb: a conversation's turns, newest first, 50 to a page, following the page token. A long chat stops at 40 pages or 45 seconds and says it is partial, rather than running into the content script's timeout and showing nothing.
The token rotates during a long session, so it is read fresh on every call. Signed into more than one Google account, the bridge uses the account of the page you are on (/u/1/…). Gemini's answers are length-prefixed chunks whose lengths cannot be trusted to slice by, so the bridge finds each JSON array by bracket matching instead.
Because the bridge runs in the page's own world, it cannot call extension APIs, and the content script cannot call anything the bridge defines. The only channel between them is window.postMessage, tagged gc: 'GeminiCounter' and matched by request id. The bridge answers its own two requests and no others, and checks a conversation id is the hex id Gemini itself uses before it goes into a request.
2. The content script (src/content/*.js)
Runs in the isolated content script world, declared in manifest.json against https://gemini.google.com/*. It is responsible for everything you see:
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