Nice extension, can switch what i use now to diffrent

This appears to be an effective agent switcher, I like it but there's just one thing, I can't set the screen resolution to something different than what my actual screen resolution is. If you could add in an option for spoofing the screen resolution this would be a 5/5 add-on :-)

Works well with Firefox Nightly v60.0a1 on Android v6.0.1. Would be vastly improved if regular expressions (extended form) could be used to match against entire URLs. Currently, only the absolute string of the top-level hostname can be checked. But with regular expressions, it would, for example, be possible to match "^[fhttps]*\:\/\/www\.google\.co(m|\.[^\/]*)\/imgres\?" against URLs, in order to specify the user agent for displaying an image returned from a Google image search. Although this is a seemingly-specific example, with extended regular expression matching, anything would be possible, as they provide maximum URL-matching flexibility.

coololol

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Very powerful, with a very deep selection of user agents that you can easily sort through based on OS and browser. Blacklist, Whitelist, and Custom filtering is available in the addon options, though curiously you have to choose between the three instead of having a combination of them. No way to bulk add user agents is the only real downside to this addon, but when it comes with such a large selection to begin with this won't inconvenience many.

I do recommend the Dev add a shortcut from the popup to get to the addon settings though.

Needs an option to export custom strings from an XML, so it won't need updating once in a while.
Overall, looks pretty solid.

Wow it is easy to use and portable too. thank you!!