By Darryl Mocek on Apr 14, 2011
I recently stumbled on a useful feature in Firefox 4, Group Tabs. Group tabs let you group the tabs you have open in Firefox into convenient groups of your choosing. I found this by hitting the button to the right of the tabs list drop-down in the upper-right corner of Firefox, just above the home icon. Once there, you'll see a group frame window which contains all of your tabs in the form of icons representing each tab. To create another group, click and drag an icon outside of the group. You'll see the icon by itself in no group, and if you click on the tab icon, you'll see a new Firefox window open with just that tab in it. Clicking on the Group Tabs icon will get you back to managing your group tabs. To continue creating your group, click and drag another tab icon and drop it on or near the previous tab icon. You'll see a frame display around the two tab icons. This represents the new group. You can name the group by clicking near the top of the group frame (there's a faint pencil icon to the left of the edit box). Resizing the group tab frame will automatically re-size the tab icons. If you click on a tab icon, Firefox will display a window with only the tabs from the group in it, with the selected tab displayed. You'll notice if you hit the tabs drop-down, you'll only see the tabs listed which are in that group. Clicking back on the Group Tab icon will take you back to managing the group tabs. You can close tabs and move them between groups easily.
Using the Group Tab interface makes it easy to manage and find tabs when you have a lot of tabs open. You can find more information on Firefox's Group Tabs here: http://support.mozilla.com/en-US/kb/what-are-tab-groups