Created attachment 788510 [details] ff.jpg User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:22.0) Gecko/20100101 Firefox/22.0 (Beta/Release) Build ID: 20130618035212 Steps to reproduce: I noticed page previews appearing instead of context menus. When I mouse over the big orange Firefox button in the uppper left, or perform a right click, I see the preview of the current page. Actual results: Please see the screenshot. Expected results: I should have seen the menus, not the previews.
Now every drop-down list shows previewa. The browser becomes unusuble. The only fix I found is disabling "Use visual styles on windows and buttons" in system properties. But that makes the UI ugly.
1) Test with HWA disabled: http://support.mozilla.org/en-US/kb/forum-response-disable-hardware-acceleration 2) Test with a clean profile: https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles 3) Be sure your GPU drivers are up-to-date. Does it fix your issue?
1) Test with HWA disabled: http://support.mozilla.org/en-US/kb/forum-response-disable-hardware-acceleration Thank you very much. This helped.
Could you paste the graphics section of about:support here. In addition, be sure your GPU drivers are up-to-date.
Its Samsung 355V5C-S0N with latest drivers. I add a screenshot to the first post.