Addon download pages trouble
I am using Firefox 31 and every time I try to get an addon, the download icon is whited out and below it says in red "not compatible with Firefox 25". Curiously, when using FF mobile (desktop site requested) there is no such error. Some addons you can download anyway, but some (such as All The Tools) you can't. Restarting FF with my addons disabled didn't work. Any ideas?
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This is the user agent of the browser you used to post here. Mozilla/5.0 (masking-agent; rv:25.0) Gecko/20100101 Firefox/25.0
It's telling websites that you are using Firefox 25.
Looks like your user agent string is incorrect and is reporting Firefox version as 25.
Follow the steps given in this article (section Firefox is showing the wrong User Agent ) to reset the user agent value.
If that does not help, you might have a user.js file which is causing the problem. Follow the steps given in this article (section User.js file overriding preferences). Note that Windows hides some file extensions by default. The user.js file is only present if you or other software has created it, so normally it wouldn't be there. You may want to check its contents with a plain text editor (like notepad) if you didn't create this file yourself.
Hi. The problem is solved. I did as Dynamite said and, sure enough, in about:config general.useragent.locale for some reason was set to Firefox 25. Right click, reset and restart Firefox did it all. Many thanks.