it's interface is easy and friendly, but you have to update UA strings because many websites break and say that my browser is old and not supported, which makes the addon useless.

Toolbar button does not appear. I tried both restarting and reinstalling. I'm using FF 68.0a1.

Compatible with Waterfox! It's very easy to use and the interface is nice. Editing doesn't allow to change the agent icon, but the strings may be freely modified (you may input a Safari string in an IE option). It has a site filter, but it's global, not individualised for each agent (that is, there can't be different UA for different sites).

No option to whitelist sites

Leider kann ich die App nicht mehr nutzen. Von Firefox wurde sie deaktiviert und nun behauptet Firefox bei der Neuinstallation, die App sei beschädigt. Was kann ich tun?

good

Show an old version of Firefox which block me on some website as slack.

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Indique une version de Firefox dépassée qui me bloquait sur certains sites tels que slack.