PR Sidebar per dannash

Your open GitHub pull requests, always visible in the Firefox sidebar.

• All your open PRs at a glance — title, repo, age, +/− diff size, comment count, draft state. Auto-refreshes every 10 seconds.
• CI status on every PR — pass/fail/pending, with failed check names on hover.
• Review state — approved / changes requested badges, merge queue position, merge conflict warnings.
• Stacked PRs render as a tree — a PR based on another PR's branch nests under it.
• Hotfix grouping — backport PRs like "fix: thing (HOTFIX 2.52)" collapse into one 🔥 row under the main PR, with a failing-CI count while collapsed. The title pattern is configurable, and the group auto-expands when you're viewing one of its PRs.
• Tab-aware — the PR you're viewing is highlighted; clicking a PR focuses its existing tab instead of opening a duplicate.
• Scoped — optionally limit to an org (org:your-org) or specific repos (repo:owner/name).

Setup: paste a GitHub token (fine-grained with Pull requests: Read is safest). Your token stays in local browser storage and is only ever sent to api.github.com.