Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.

• Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
• Do NOT click the Reset button on the Safe Mode start window

• https://support.mozilla.org/kb/Safe+Mode
• https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

What do you mean with "new tab position not configurable"? What position?

I've uninstalled the Chinese version with error, then installed the English version just now, most of errors fixed. but still cannot find the place to configure the new tab in the end of the tab list rather than the place next to the current one, which is available for previous version, need your professional help, thanks!

Just to clarify, let's say you have tab 1 Google results and tab 2 something else. When you Ctrl+click a link in tab 1, it opens between tab 1 and tab 2 instead of at the end? Here's how you switch that:

(1) In a new tab, type or paste about:config in the address bar and press Enter. Click the button promising to be careful.

(2) In the search box above the list, type or paste tabs and pause while the list is filtered

(3) Double-click the browser.tabs.insertRelatedAfterCurrent preference to switch it from true to false.

You can switch back to an earlier tab and test. Success?

See also:

• http://kb.mozillazine.org/about:config

Another pref that might be of interest:

• http://kb.mozillazine.org/browser.tabs.selectOwnerOnClose