Keywords are stripped from Firefox. I use this feature quite a bit. Needs to be fixed. I saw a report on this from 5 years ago on the Android forum. I have a whole section of searches set up for searches from everything from UPS to Google to Facebook. Chrome implements this a little bit differently so they don't need to be sent to chrome browsers however they should be sync'ed from one Firefox to another.
Servicio de atención al cliente por UserEcho