Does exactly what it's meant to do! I do have two personal suggestions, however:

The language of the settings, I think, should be changed, as they're a bit confusing at first. For starters, the "maximum number of tabs" is actually the tab number at which the extension will begin limiting; that is, I have the limit set to 11, but I can only have 10 tabs open at once. I feel that this should be changed so that the number represents exactly how many tabs you can have open at once.
Here are the ways I, personally, might change the rest of the language:
* "Above limit per window [if unchecked, applies globally]" -> "Apply tab limits to individual windows (as opposed to browser-wide limits)"
* "When exceeded, remove tab:" -> "When tab limit is exceeded..."
* "Newest" -> "remove most recently opened tab"
* "Least recently used" -> "remove least recently used tab"
* "Left-most" -> "remove left-most tab"
* "Right-most" -> "remove right-most tab"

* "And play sound:" -> "Play this sound when I try to exceed my tab limit:"
* "No sound" -> "Don't play a sound when I try to exceed my tab limit"

These may seem pretty pedantic, but I was a bit confused when I first saw the options. Finally, there exists a work around that should probably be addressed: if you set the tab limit to only apply to each individual window, you can open a new window and then drag the tab into the original one, thus exceeding your tab limit from that window. In my opinion, a global tab limit should be the default.

Awesome work!

Love the extensions, helps a lot with my ADHD! One thing that makes experience painful though is not being able to set sound volume - while the sounds are reasonable, often they are obnoxiously loud. In addition it's really painful when the app prevents opening it's own settings due to the limit, but it's really minor compared to lack of volume control.

Excellent addon, simple! The only issue I have is that it doesn't count pinned tabs.

Excellent add-on! Gets the job done!

A very convenient extension for those who can open up to 100 tabs in just one day (as I often do). It could be improved (by adding more sounds, for instance), but if Rudy created it for his son, he probably knows better what needs to be improved.

The only thing that bothers me is the icon, which is yellow and tends to fade with the white colors if you use a light interface on Firefox. It would be great if choosing the icon among other ones was an option or, even better, importing our custom icon.

Awesome except.... for the annoying sound when trying to open an extra tab! You really should make it customizable so I can pick a gentler sound. Otherwise it's great - thank you for sharing it.

This is an excellent plugin for anyone who struggles to self-regulate their browsing. One request to make this extension even better - Is there a way to count pinned tabs towards the total number of open tabs?

Very useful addon but it missing a vital feature which is "Warning message when tabs number exceeded"