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The step the milestone exists for. sign-extension ungates from main-only to main-or-dev, and build-web downloads the XPI on dev as well, so a dev push produces an image carrying the extension that is being developed rather than requiring a merge to try one. Not two signatures. The version is the commit TIME of the newest packaged extension change, so dev and main derive the SAME number for the same source. A dev push that changes the extension signs it; the merge to main finds the ext-<version> release already there, hits the cache, and bundles the byte-identical XPI into :latest with no second AMO call. One signature per extension CHANGE, shared by both channels. That property is what makes two channels affordable at all, and it is why step 4 had to land first: ungating this while the version was still the hand-set 1.0.11 would have found the existing ext-1.0.11 release, skipped AMO, and bundled main's stale XPI into :dev — a dev channel confidently serving old code. Tags stay excluded. The tag path deliberately skips signing and polls for the release instead (the 2026-05-27 race). The ext-<version> release's target_commitish moves from the literal "main" to $GITHUB_SHA. Either branch can create that release now, and tagging a dev-signed XPI against a main commit that need not even contain the source it was built from is a lie that costs nothing to avoid. Known, not addressed here: two concurrent builds that both derive the same unsigned version will both call AMO and the loser gets a 409. The window already existed between main and tag pushes; dev signing widens it. It fails loudly rather than shipping anything wrong, and the rollback trap cleans up the empty release. Filed separately. Also unchanged here: ci.yml's manual-bump guard is still in place and still false. It does not fire on this commit — nothing packaged changed — but it will fail the lane on the next extension change, demanding a bump that no longer decides anything. Step 5 next.