Revert change from d217aeae to content/install.js.
Revert change from d217aeae to content/install.js.

Via:
git checkout 5720130f content/install.js17:00:51

Fixes #1178.

Martii/greasemonkey,Ventero/greasemonkey,HasClass0/greasemonkey,Martii/greasemonkey,HasClass0/greasemonkey,the8472/greasemonkey,Ventero/greasemonkey,the8472/greasemonkey