Look at Tab Mix Plus Options. Tools > Add-ons > Extensions, locate and click on Tab Mix Plus, click Options, in the Tab Mix Plus interface, click Events, click the Tab Opening tab, look at what you have check marked on that panel. Un-check any that you need to, restart Firefox and test. If that does not solve the problem, reset a preference: You can change a preference to make tabs open (1) at the end of all open tabs, <u>'''''or'''''</u> (2) immediately after the current tab. -Type '''about:config''' in the URL bar and press the Enter key. -If you see the warning, accept it (promise to be careful). -Filter = browser.tabs.insertRelatedAfterCurrent -Look at the "Value" column ('''''false'''''=open at end, '''''true'''''=open after current tab) -Double-click that preference to change the value, if you need to -Restart Firefox (File > Restart Firefox) NOTE: The settings in Tab Mix Plus <u>'''will over-ride the preference setting'''</u>.

<u>'''Steve Buscemi'''</u>: Pushed the submit button to soon. <u>'''''Other Issues'''''</u>: ~~red:You have installed plug-ins with known security issues. You should update them immediately.~~ <u>'''Update Java'''</u>: your ver. 1.6.0.~~red:18~~; current ver. 1.6.0.20 (<u>important security update 04-15-2010</u>) (Firefox 3.6 and above requires Java 1.6.0.10 or higher; see: http://support.mozilla.com/en-US/kb/Java-related+issues#Java_does_not_work_in_Firefox_3_6 ) ''(Windows users: Do the manual update; very easy.)'' ~~red:Check your version here~~: http://www.mozilla.com/en-US/plugincheck/ See: '''[http://support.mozilla.com/en-US/kb/Using+the+Java+plugin+with+Firefox#Updates Updating Java]''' Do the update with Firefox closed. <u>'''NOTE:'''</u> Java version 1.6.0.21 has been released. It is mainly an update for developers of Java applications and most users do not need to be concerned about downloading version 1.6.0.21. <u>'''''At this time'''''</u>, the update option in existing installations of Java 1.6.0.20 are not updating to version 1.6.0.21; <u>'''''at this time'''''</u>, it must be manually downloaded and installed. According to the Java release notes: ''"'''Bug Fixes''''' ''Java SE 6 Update 21 does not contain any additional fixes for security vulnerabilities to its previous release, Java SE 6 Update 20. Users who have Java SE 6 Update 20 have the latest security fixes and do not need to upgrade to this release to be current on security fixes."'' Source: http://java.sun.com/javase/6/webnotes/6u21.html <u>'''You '''</u>~~red:<u>'''MAY'''</u>~~<u>''' need to Update Adobe Reader for Firefox (aka Adobe PDF Plug-In For Firefox)'''</u>: your ver. N/A; current ver. 9.3.3 (important security update release 06-29-2010; see: http://www.adobe.com/support/security/bulletins/apsb10-15.html) ~~red:Check your version here~~: http://www.mozilla.com/en-US/plugincheck/ See: http://support.mozilla.com/en-US/kb/Using+the+Adobe+Reader+plugin+with+Firefox#Installing_and_updating_Adobe_Reader ''<u>You may be able to update from the Adobe Reader installed on your system</u>'' instead of going to the Adobe site and downloading. Open the Adobe Reader installed on your system (''in Windows, Start > Program Files, find and click Adobe Reader to open''), click Help, click Check for Updates. ''<u>If you go to the Adobe site to download the current Adobe Reader:</u>'' -'''<u>use Firefox to download</u>''' and <u>'''SAVE to your hard drive'''</u> (save to Desktop for easy access) ~~red:-See the images at the bottom left of this post to see the steps to take on the Adobe site~~ -exit Firefox (File > Exit) -In Windows: check to see that Firefox is completely closed (''Ctrl+Alt+Del, choose Task Manager, click Processes tab, if "firefox.exe" is on the list, right-click "firefox.exe" and choose End process, close the Task Manager window'') -In Windows: double-click on the Adobe Reader installer you just downloaded to install/update Adobe Reader *<u>'''NOTE: On Vista and Windows 7'''</u> you may need to run the plugin installer as Administrator by starting the installer via the right-click context menu if you do not get an UAC prompt to ask for permission to continue (i.e nothing seems to happen). See this: http://vistasupport.mvps.org/run_as_administrator.htm *'''<u>NOTE for IE:</u>''' Firefox and most other browsers use a Plugin. IE uses an ActiveX version. To install/update the IE ActiveX version, same instructions as above, except use IE to download the ActiveX installer. See: [[ActiveX]] *Also see: http://kb.mozillazine.org/Adobe_Reader ~~red:'''''AND'''''~~ [[How do I edit options to add Adobe to the list of allowed sites]]