What changes
See the branch relationship you care about. Ahead and behind counts are recalculated against your fork’s default branch.
Before
Counted against upstream, and every link here opens a pull request against upstream.
After
Counted against your own default branch, and the links stay in your repository.
Simple, per-repository setup
The fix is opt-in. Enable it for a single repository or use owner/* for an account, while
forks used for upstream contributions remain unchanged.
Everything it fixes
All the usual compare links
It corrects the Contribute menu, branch banners, ahead links, and direct new-pull-request URLs.
Compare against your own base
Your fork’s default branch becomes the base, so the diff matches the work you intended to review.
Private by design
No sign-up and no data collection. Just local settings and the GitHub requests needed to fix the page.
You control the scope
Choose individual forks or an entire owner. The extension does nothing outside the scope you set.