An indispensable asset in Firefox. It’s a huge lifesaver for testing responsive layouts across different platforms and helps bypass websites that artificially restrict access for Firefox users. A huge plus for the ability to configure custom strings and setup automatic rotation.

Hi, thanks for the add-on. It was a bit difficult at first to figure out how it works, but after I discovered that all the buttons have tooltips, it got much easier.

I have an enhancement suggestion: perhaps it would be more convenient if the filter in the popup window would not simply grey out items that don't match it, but hide (collapse) them, so that only what the user searches for is displayed.

Currently it works fine. Don't know why people reported different 4 months ago.
It does cause issues: Youtube subtitles can't be displayed, Claude uploads are getting rejected.

This has so far not caused the dreaded Cloudfare veryifying loop that the agent switcher by ntninja does. I thought Cloudfare was just completely against agent switchers until I tried this one instead.

Very useful, thank you!

Used to work great, until the latest update (v0.6.5.1)

I’ve been using this extension for a while and it worked flawlessly up until version 0.5.0. Unfortunately, after updating to version 0.6.5.1, it completely stopped working for me, user agents no longer apply as expected, which defeats the purpose of the tool.

Thankfully, Firefox allows users to install older versions of extensions. If you’re experiencing the same issue, you can roll back to a previous version here: addons.mozilla.org/nl/firefox/addon/user-agent-string-switcher/versions

Hopefully, the developer can resolve the problems introduced in the latest release. Until then, version 0.5.0 remains the most stable choice.

Amazing open source extension, thank you for your work

This addon has taught me that nearly all web sites that supposedly aren't compatible with Firefox actually are compatible. I use this at work, on my android phone, and on my home PC as well. It's an essential addon, in my opinion, and I've had nothing but success.

Its great