Why is Firefox 9 incompatible with Adobe Acrobat?
When the Acrobat 10 plugin is enabled, Firefox menus don't work properly -- they disappear when dropping down, they oscillate, or just the outline is visible without the menu items. Disabling the Acrobat plugin immediately fixes the errors.
This happened once before when an older version of FF was first released.
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Perform the suggestions mentioned in the following articles:
- Use Adobe Reader to view PDF files in Firefox
- Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems
- Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems
Check and tell if its working.
Might not be related to your problem but some of your Plugins are out-dated
- Update All your Firefox Plugins -> https://www.mozilla.org/en-US/plugincheck/
- When Downloading Plugins Update setup files, Remove Checkmark from Downloading other Optional Softwares with your Plugins (e.g. Toolbars, McAfee, Google Chrome, etc.)
Try disabling Hardware Acceleration in Firefox.
Options > Advanced -> General - Browsing