Macintosh OS/Firefox view
An odd thing happened to our Firefox screen appearance and I can't figure out how to get it back to normal. Instead of seeing at the top of the screen the three buttons upper left, the URL space and the horizontal list of bookmarks we have dragged in, we now see the black bar at top which lists "search, images, maps, play, YouTube, etc. Do you know what happened and how we can get the appearance back to normal? Thank you. Mac 10.6
Solution 1: Reset Firefox to its default state
Note: When using the reset feature, your bookmarks, browsing history, passwords, cookies and web form auto-fill information will be saved. However, your extensions and themes will be removed; open tabs, windows and tab groups will not be saved; and your preferences will be reset. Learn more.
At the top of the Firefox window, click the Help menu and select Troubleshooting Information.
Reset Firefox 1 - WinXP
Click the Reset Firefox… button in the upper-right corner of the Troubleshooting Information page.
Reset Firefox 2 - WinXP
To continue, click Reset Firefox in the confirmation window that opens.
Firefox will close and be reset. When it's done, a window will list the information that was imported. Click Finish and Firefox will open.
Solution 2: Delete Firefox preference files
At the top of the Firefox window, click on the Help menu and select Troubleshooting Information. The Troubleshooting Information tab will open.
Under the Application Basics section, click on Show Folder. A window with your profile files will open.
Note: If you are unable to open or use Firefox, follow the instructions in Finding your profile without opening Firefox.
At the top of the Firefox window, click on the File menu and then select Exit
Locate and delete the prefs.js file. If you find more than one, a prefs.js.moztmp file or a user.js file, delete these as well.
You can close the profile folder and open Firefox now.
Solution 3: Download and reinstall Firefox