Starting November 21, 2022 add-on developers are welcome to upload their Firefox Manifest version 3 (MV3) compatible extensions to addons.mozilla.org (AMO) and have them signed as MV3 extensions. Getting an early jump on MV3 signing enables you to begin testing your extension’s future functionality on Nightly to ensure a smooth eventual transition to MV3 in Firefox. To be clear, Firefox will conti
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