User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.16) Gecko/20080702 Firefox/2.0.0.16 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.16) Gecko/20080702 Firefox/2.0.0.16 Browsing between tabs in Firefox by CTRL+TAB is not in a stack form. For example open 4 tabs A, B, C and D and focus on B then D. it is more user-friendly that when you press CTRL+TAB Firefox focuses tab B. but now it focuses on A. because it is better for user to open the tabs on his history order. Now in Firefox the order of focusing is just left to right. Reproducible: Always Steps to Reproduce: 1. open 4 tabs A, B, C and D 2. focus on B then D 3. press CTRL+TAB Actual Results: By pressing CTRL+TAB, Firefox focuses on tab A. Expected Results: It is more user-friendly that By pressing CTRL+TAB, Firefox focuses on tab B.