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(During rebasing of the previous patches I happened to look at the polyfills and noticed that this one could be removed now.) See: - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array/toHex#browser_compatibility - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array/toBase64#browser_compatibility - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint8Array/fromBase64#browser_compatibility Note that technically this functionality can still be disabled via a preference in Firefox, however that's slated for removal in [bug 1985120](https://bugzilla.mozilla.org/show_bug.cgi?id=1985120). Looking at the Firefox source-code, see https://searchfox.org/firefox-main/search?q=array.tobase64%28%29&path=&case=false®exp=false, you can see that it's already being used *unconditionally* elsewhere in the browser hence removing the polyfills ought to be fine (since toggling the preference would break other parts of the browser).