I rarely review anything, but I could easily write a book regarding how much I love this extension. It is so simple yet adds a whole other level to Firefox customization that makes "custom themes" and customizing firefox using firefox's options seem like child's play. I can honestly say that I will never go back to using firefox without this extension. It feels like upgrading from Windows 95 to Windows 10, but for your browser. If you enjoy customizing your browser and frequently use firefox with multiple tabs this extension is perfect for you. (If you only use your browser once a week to check your email and don't know what tabs are, then you definitely won't have the same reaction as I did) I have multiple tabs open throughout the day for work but I'm not always actively using my browser. Instead of minimizing firefox, I now just open a new tab page and leave that open whether in the background or just full screen it and use it as a "background/screensaver" by using a Win 10 app to prevent my computer from locking/sleeping (Work computer which requires admin status to change screen lock timeout settings)

The customization options are so simple and easy to use, but they allow you to come up with an infinite amount of possibilities.

My only recommendation would be to add an option for backing up your current settings/configuration. I'm hoping the settings are saved to my firefox account as I have sync enabled for add-ons but I haven't tested it. (Don't want to risk losing my current setup just to test it)

One other recommendation, for down the road if its even possible, would be allowing multiple "profiles" to be saved and easily switched to so users could design and customize one for work and one for home. (I take my work laptop to and from the office everyday) Or even just have different customization profiles to use and switch between whenever desired without having to reconfigure your settings. I'm not sure if that's possible, and even if it never happens, I still could not be thankful enough for this extension and how much I love it.

I will definitely be donating to the tabliss team as this is something I would gladly pay to use. It is truly amazing they did this all for free, without requiring any privacy permissions, and without any ads or other bloatware. Bravo to your team, and thank you again!