I have to assume that the drop-down menu in Firefox was already tried and found wanting. If not, try this:
Across the top, pick the Tools drop down and select Options at the bottom. Then go to Content. Maybe that has something that will work?
*shrug*
OOooops, I now see that the Options option is unavailable in Ubuntu 14.10. There it is under the Edit drop-down, then the Preferences.
Doesn't look like that will help, however.
Edited by xongsmith, : drop-down menus appear to OS dependent
- xongsmith, 5.7d