I love the slimsearch extension for FireFox, but I wanted it to open in the tabs in the background instead of the foregound. After reading up a bit, asking some questions, and playing around with it, I was able to achieve a small success. You can create a test FF profile with the profile manager. Type: "firefox.exe -p" into your run command. assign a name to your test profile. Download or make a copy of slimsearch. Put it in a handy folder or desktop. Open with 7-zip. Navigate down to the chrome folder, using "open inside". When you see the search.js folder use the edit feature to open it. Locate this portion, near the very end of the script: "browser.selectedTab = browser.addTab(URL);" Remove this part "browser.selectedTab =" (be sure to remove all the spaces in there too, clear from the return to the beginning of the words "browser.addTab(URL);". When you get done all you should have there in that command is "browser.addTab(URL);" Save file. When 7-zip asks you, click OK to update archive. Go ahead and drag it into an open Firefox window. Restart. Install into main/additional profiles. You can archive it now or overwrite your old, un-modded copy. Werkz fer me.