GitHub Resizer

About

GitHub Resizer puts a slider in your Chrome's toolbar that lets you choose **exactly how wide** GitHub pages should be - anywhere between GitHub's native 1280 px layout and the full width of your browser window, in 1 % steps.

Most "wide GitHub" extensions are an on/off switch: either you get the default narrow layout, or you get the full screen. GitHub Resizer answers a different question: *how wide?* Pick 25 % for a comfortable reading width on a 4K monitor, 50 % on an ultrawide so code blocks stay readable, or 100 % to fill the entire screen.

**Features**

- Smooth slider from 0 % (default GitHub) to 100 % (full viewport) in 1 % steps.
- Quick presets: 25 %, 50 %, 75 %, 100 %.
- Live updates - your setting is applied to every open GitHub tab instantly, without a page reload.
- Cross-device sync - your chosen width follows you to other computers via your Firefox account (`storage.sync`), with a local fallback.
- Safe on small screens - on viewports up to 1280 px the extension does nothing, so GitHub looks identical to its default layout.
- Works on modern GitHub - also widens the inner content column on the new Primer-based GitHub pages, so the page doesn't end up wide-on-the-outside but narrow-in-the-middle.
- Keeps READMEs and other markdown content responsive instead of capping them at a fixed width.

**Where it works**
- `github.com` (repos, pull requests, issues, code view, README, etc.)
- `gist.github.com`

GitHub Enterprise and custom-domain GitHub installs are not currently supported.