What is Manifest V3?
https://extensionworkshop.com/documentation/develop/manifest-v3-migration-guide/
Manifest V3 (MV3) is the umbrella term for several foundational changes to the WebExtensions API in Firefox. The name refers to the declared manifest_version key in each extension’s manifest.json file.
The Manifest V3 changes apply to extensions for Safari, Firefox, and Chromium-based browsers – such as Chrome, Edge, and Opera. While the goal is to maintain a high degree of compatibility between the Firefox, Safari, and Chromium extension platforms, our implementation diverges where we think it matters and where our values point to a different direction.
This article discusses the changes introduced with Manifest V3 in Firefox and highlights where they diverge from the Chrome and Safari implementation.
Submitting an Addon for Firefox - Steps:
https://extensionworkshop.com/documentation/publish/submitting-an-add-on/
Would be nice if free republic had its own app