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There's a migration guide here: https://extensionworkshop.com/documentation/develop/manifest...

Since they aren't taking away the onBeforeRequest() functionality, I don't see a good reason why greasemonkey can't be ported over.

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Under "Scripting API" it says "the code parameter is removed so that arbitrary strings can no longer be executed [...] you need to move any arbitrary strings executed as scripts to files". I don't see how something like greasemonkey can continue existing given that limitation.

Ah, yeah, that does look like a gap. Tampermonkey's related issue, though it seems to be mostly focused on Chrome: https://github.com/Tampermonkey/tampermonkey/issues/644

This is because Firefox is adding Manifest v3 support without dropping v2 support, unlike Chrome.

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