Could you try version 18.0.1? Also, please provide us with screen shots? And, you can check if your add-ons are causing this as well.

Try the Firefox Safe Mode to see how it works there. The Safe Mode is a troubleshooting mode, which disables most add-ons.

(If you're not using it, switch to the Default theme.)

• You can open the Firefox 4.0+ Safe Mode by holding the Shift key when you use the Firefox desktop or Start menu shortcut.
• Or use the Help menu item and click on the Restart with Add-ons Disabled... menu item while Firefox is running.

Don't select anything right now, just use "'Start in Safe Mode" To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before using the Firefox shortcut (without the Shift key) to open it again. If it is good in the Firefox Safe Mode, your problem is probably caused by an extension, and you need to figure out which one.

Please follow the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article for that.

When you figure out what's causing your issues, please let us know. It might help other users who have the same problem.

Try to disable hardware acceleration in Firefox.

• Tools > Options > Advanced > General > Browsing: "Use hardware acceleration when available"
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

• https://hacks.mozilla.org/2010/09/hardware-acceleration/

You can check for problems with the places.sqlite database file in the Firefox Profile Folder.

• http://kb.mozillazine.org/Bookmarks_history_and_toolbar_buttons_not_working_-_Firefox
• https://support.mozilla.org/kb/Bookmarks+not+saved#w_fix-the-bookmarks-file

Thx. for the suggestion. Disabling HW acceleration appears to resolve the issue. However, the issue appeared just a few releases ago. Sorry, can't tell you which... No changes to the video card or driver in between.

HW/Driver info:

Graphics

   Adapter Description: ATI Radeon HD 2400 PRO
   Vendor ID: 1002
   Device ID: 94c3
   Adapter RAM: 128
   Adapter Drivers: aticfx64 aticfx64 aticfx32 aticfx32 atiumd64 atidxx64 atiumdag atidxx32 atiumdva atiumd6a atitmm64
   Driver Version: 8.970.100.3000
   Driver Date: 7-3-2012
   Direct2D Enabled: false
   DirectWrite Enabled: false (6.2.9200.16492)
   ClearType Parameters: DISPLAY1 [ Gamma: 2200 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 50 ] DISPLAY2 [ Gamma: 2200 Pixel Structure: RGB ClearType Level: 100 Enhanced Contrast: 300 ]
   WebGL Renderer: Google Inc. -- ANGLE (ATI Radeon HD 2400 PRO) -- OpenGL ES 2.0 (ANGLE 1.0.0.1242)
   GPU Accelerated Windows: 0/1