- build fennec according to these build instructions
- don't follow these outdated instructions, e.g. there are no patches needed
- before you wonder, the build is a out-of-sourcedir build, but using a directory on the same level as your sourcedir, so if you have the sources in ~/projects/mozilla-central, you will have the binaries in ~/projects/mozilla-central-mobile-qt-obj
- you can run the browser without installing:
~/projects/mozilla-central-mobile-qt-obj/mobile/dist/bin
./run-mozilla.sh ./fennec