1 Answer

To revert to the previous version, do the following.

Go to Download Firefox v3.6.17 and download it to the desktop.

Then go to Add/Remove Programs, scroll down to Mozilla Firefox and remove it, choosing to keep your bookmarks, customizations etc., (don't checkmark the box).

Then reboot and delete the folder called Mozilla Firefox at this location: C:\Program Files\Mozilla Firefox

Finally run the installation file you downloaded to the desktop earlier.

Your bookmarks, customizations etc., are maintained in a different location and will become available to you again once you complete the installation.

After you complete the installation, go to the Plugins Check page and update those where necessary.

However, before you go that route, here are a few tips to make FF4 look like the previous version.

Right click a blank part of the tab bar and click "Tabs on top" to remove the checkmark. Tabs will subsequently reappear below the search bar.
Repeat the same steps, but click the top one called "Menu bar". This will reinstate the text links at the top.
To rearrange the layout, repeat the same steps again and choose "Customize". A panel will open and while that remains onscreen, you can move elements like toolbars, buttons etc around and place them anywhere you wish. You can also drag anything you don't like into that panel and add anything you want by dragging it out of there.
To replace the status bar at the foot of the page, install this add-on: https://addons.mozilla.org/en-US/firefox/addon/status-4-evar/
See screenshot. Both upper and lower views are Firefox 4.0. The above steps will make it look like the one in the top half of the picture.>>>>

Firefox 3.6.17 will be supported for a while yet, but will eventually fall by the wayside. >>>> http://support.mozilla.org/en-US/questions/819720