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The guard asked whether a packaged extension file changed without the version moving. Since step 4 nobody moves the version by hand, so it was checking a fact that had stopped existing — and it was not merely dead weight: it would have failed the lane on every real extension change, demanding a bump that decides nothing. Removed rather than left running beside the new mechanism (rule 22). What replaces it is thinner and true. The extension-version lane now asserts the derivation resolves on this commit, that the derived value is the plain dotted-numeric shape AMO accepts, and that MAJOR.MINOR agrees between manifest.json and package.json. MAJOR.MINOR is the one part still hand-set, and packaging.sh reads it from manifest.json ALONE, so a divergence ships a version package.json disagrees with. The lane keeps fetch-depth: 0 — checking that the derivation survives a real checkout is half its remaining value. Deliberately not checked there: that the derived value beats what is already signed. That guard belongs in build.yml, where it compares against the real ext-* releases. Comparing against origin/main in a lane would be wrong, because dev legitimately derives a LOWER value whenever main is ahead on the extension, and a lane that fails for being behind is a lane people learn to ignore. packaging.sh is down to two consumers from three. version.spec.js's "ci.yml derives its pathspec" test would have gone red on that, so it is rewritten to assert the property rather than the consumer: no workflow inlines an :(exclude)extension/ literal, across all three. That keeps the #2397 anti-regression value while surviving consumers coming and going. A second test pins build.yml to packaging.sh version and fails if it goes back to grepping the committed value — which is not a style regression but the #3092 bug itself. build.yml joins extension.yml's trigger paths, since the suite now asserts against it. The lockstep test narrows from the whole version string to MAJOR.MINOR. The committed patch numbers are inert now; asserting on them would fail for a difference that changes nothing. Docs. extension/README.md's Release section described extension.yml signing on main and committing the XPI into frontend/public/ — untrue since 2026-05-25, and it told the reader to hand-bump both files, which is now exactly the wrong instruction. Rewritten, with a Versioning section that says plainly that editing the patch number does nothing and why the key is commit time rather than a count. ci-requirements.md drops the third packaging.sh consumer and names every job that needs full history. Root README no longer claims the extension is signed on main only.