Gemini Auto-Thinking

Chrome extension that automatically switches new Gemini chats from Fast to Thinking mode.

Installation

1. Open Chrome and go to chrome://extensions
2. Enable Developer mode (top-right toggle)
3. Click Load unpacked
4. Select this folder (gemini-thinking-extension)

How it works

A content script runs on gemini.google.com. When a new chat is detected (initial load or SPA navigation), it:

1. Checks whether Thinking mode is already active
2. If not, looks for a visible "Thinking" option to click directly
3. If the selector dropdown is closed, it opens it first, then clicks Thinking

It retries several times (at 0.8 s, 1.5 s, 2.5 s, 4 s, 6 s) to handle slow renders.

Troubleshooting

If the extension stops working after a Gemini UI update, open DevTools on gemini.google.com, find the mode-switcher element, and update DROPDOWN_TRIGGER_SELECTORS or the label constants at the top of content.js.

Console messages are prefixed with [Gemini Auto-Thinking] for easy filtering.

Icons

The manifest.json references icon16.png, icon48.png, icon128.png. These are optional — Chrome will use a default icon if the files are absent. Add your own PNGs if desired.