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Can Waterfox load all the up-to-date Firefox extensions or it is stuck with the old plug-in system?

Support MV2, MV3 like Firefox, and also supports "classic" bootstrapped extensions, if they've been updated, which you can randomly find on Github.

1Password does not work as well as in Firefox (switched with the ToS change)

More worrying, ublock does not block as much as on Firefox.