docs(webextensions): document cross-browser MV3 background fallback#44108
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danyalahmed1995 wants to merge 5 commits into
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docs(webextensions): document cross-browser MV3 background fallback#44108danyalahmed1995 wants to merge 5 commits into
danyalahmed1995 wants to merge 5 commits into
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Rob--W
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May 13, 2026
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rebloor
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…ound/index.md Co-authored-by: rebloor <git@sherpa.co.nz>
…ound/index.md Co-authored-by: rebloor <git@sherpa.co.nz>
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Summary
Adds a focused section to the WebExtensions
backgroundmanifest documentation explaining how a Manifest V3 extension can specify bothbackground.scriptsandbackground.service_workerfor cross-browser background behavior.The update also clarifies that
background.preferred_environmentis not required for the basic fallback behavior, and should only be used when an extension specifically wants to prefer a service worker where available.Fixes #44100.
Validation
npx --yes prettier@3.8.3 --check "files/en-us/mozilla/add-ons/webextensions/manifest.json/background/index.md"npx --yes --package markdownlint-cli2@0.22.1 --package markdownlint-rule-search-replace@1.2.0 markdownlint-cli2 "files/en-us/mozilla/add-ons/webextensions/manifest.json/background/index.md"git diff --check