GitHub Fork Compare Fix

Makes GitHub compare/pull request links on your forks point at your own repository instead of upstream.

On a fork, GitHub points every compare and pull request link at the upstream repository — the Contribute menu, the "Compare & pull request" banner, and the "N commits ahead" link in the branch info bar. If you use your fork as a repository in its own right, that is the wrong target every single time, and opening a pull request against upstream by accident is far too easy. This extension fixes that for the repositories you choose: • Compare and pull request links point at your own repository, comparing your branch against your fork's own default branch. • The branch info bar and the Contribute menu are restated against your default branch, so they read exactly like a repository that is not a fork — with the real commit counts, not the ones relative to upstream. • Links that mean the opposite (the "N commits behind" link) are left alone. • Optionally redirects when an upstream compare page is already open. • Enable a repository with one click from the toolbar, or list them as owner/repo or owner/* in the options page. Repositories you have not enabled are untouched, so forks you genuinely contribute upstream from keep working exactly as before. Privacy: no accounts, no tokens, no third-party requests, no telemetry. It reads github.com pages using your existing session and stores your list of repositories in extension storage. That is all. Source code (GPL-3.0): https://github.com/D3SOX/gh-fork-compare-fix