Find a way to get version defines working for useragent overrides #22
Description
In UXP, they have a bunch of selectors to automatically select the correct app version for useragent overrides, and I'd like to have something like that here, but I've been unable to get it working. I tried with MOZILLA_UAVERSION instead of 115.0 in the useragents, and I just end up with @MOZILLA_UAVERSION@ in the about:config string instead of the version that should be there. Even if I hardcode #define MOZILLA_UAVERSION 115.0 for example I still get @MOZILLA_UAVERSION@ in the string. I don't know why this isn't working.