Worked perfectly no issues. Simple and sweet.

Allows domain or URL-specific spoofing, exactly what I need.

Works mostly as described. Unfortunately it doesn't seem to support wildcards (*) in url patterns, meaning eg every subdomain of a given parent domain must be listed separately, which is not convenient.

https://discourse.mozilla.org/t/-/67381/14?u=grahamperrin

Very awkward to use. It can't be activated for the current Page/site, but, instead, its address must be manually added to the list of the desired agent string, what is possibly the worst way to implement it (what if a site matches more than one list, the first string is selected or does it randomise amongst all matches?) I also had problems using * as a wildcard, forcing me to use full URL.

priority not working anymore

This add-on functions as the name says.

Gripes: The add-on is not suited for small screens, especially on Android, as some of the Android phones' smallest screen resolutions are only 240x320px in size.

this crap is totally unusable

It now works after I've restarted the browser three times. Don't know why :-)

The addon works like a charm and it is the most powerful when it comes to change UserAgent.
Definitely a must-have for advanced users in the need of this feature.

However, i believe, it could have a simpler settings' page if one could have a combo box for Platform Selection, another for OS selection and another for Browser Selection, all separated from each other (leading to the final User Agent String).

That would work kind of a "step-by-step wizard" that would avoid the actual very (VERY) long options' combo box that might scare new users...

Working

Thanks

It's not work on Firefox for Android

Its a awsome addon,i can chose my private ua though it,but only for more experience user

It works nicely on desktop, but I can't install it on android. Can you mark it compatible with ff for android too?

Works, but setting a default user agent (by using *) will supersede all custom domain rules.

It only needs to be recursive to be 5 stars, but it must be complex to implement this functionality.