Change the way the firefox extension environment is detected.
Revert "Change the way the firefox extension environment is detected."

This reverts commit 8680b8cf33e58597e978d2282bb03e492520e25d.
Clarifications & polishing in interface/social.js.
Merge pull request #52 from matthild/mhild_polishing

Clarifications & polishing in interface/social.js.
Merge branch 'master' of github.com:freedomjs/freedom into v0.5