Rexford G. Tugwell is a user on octodon.social. You can follow them or interact with them if you have an account anywhere in the fediverse.
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The new extension framework for Firefox was necessary to get rid of legacy codebase and its limitations are there to prevent malicious addon behavior and other security issues.
All of the undinspensable addons (uBlock Origin, uMatrix, HTTPS Everywhere, NoScript, Privacy Badger...) have survived the framework change. Very few interesting addons have stayed legacy-only.
Change isn't always bad. Sometimes you need to start from scratch.
@Siphonay Tab Mix Plus, though.
