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At Firefox' recommendation, I added an extension/addon called 'single pane extension' where I think the idea was that Firefox could be save better. But since the install Firefox has become unusable. I can only use it in safe mode. Here is a screenshot. Sorry, but I can't figure out how to fix this.

I am trying very hard to use Firefox Quantum and move on from Firefox 56, and the one thing that most drives me crazy is the single row for tabs.

I've tried implementing workarounds with the userChrome.css, such as the one found here: https://github.com/Izheil/Quantum-Nox-Firefox-Dark-Full-Theme/tree/master/Multirow%20and%20other%20functions/Multirow%20tabs — but all my attempts have failed.

Does anyone know of another solution?

It's been horrible using a browser with only one row for tabs. It's very hard to find the tabs I want and to manage my open tabs, even using the menu which shows all of them. I often have no idea of how many tabs I have open, and I often end up with multiple tabs for the same page because I am not aware that it is already open or because it would take too long to find it.

With Firefox 56 and Tab Mix Plus, I usually had around 40 to 50 tabs open most of the time, and when I'm researching stuff this number easily gets to the hundreds for a while. With Firefox Quantum I have been unable to manage my tabs properly: I end up with much more tabs than I really need and it's hard to keep then organized.

I feel like I am struggling to save a marriage that can't be saved. I don't want to leave Firefox, but it's becoming unbearable. Feel free to suggest another browser as a solution to my problem.

I have a Debian 9.5 (stable) with Cinnamon DE. I didn't want to use backports repositories, so I downloaded the Firefox Quantum ESR tar.bz2 file and unpacked it.

By default, there are no possibilities to extend the bookmarks toolbar for more than 1 row. Pre-Quantum FFs had an extension to solve this issue but that doesn't work anymore. I tried a lot of solutions recommended on Github or Reddit but none of them were able to provide a working solution.

Do you have any idea?