Was incredibly satisfied with this add-on, as it does essentially do what it says, sends all your tabs to a single directory, thus freeing up your firefox resources, *was* satisfied that is until I learned it apparently automatically deletes your tab groups after a certain period of time. Finally had some free time to poke through all the various articles and pages I'd set aside for future viewing, only to find that OneTab had deleted all but my most recent stored tabs which is explained nowhere in the addon's documentation, nor are there settings to adjust when these deletions occur. Three stars because it does indeed do what it says initially, but be sure to return to your stored tabs promptly and back up whatever you want to keep for future perusal because you never know when it may be lost. Very disappointed with this.