This add-on is exactly what I was looking for! But I have a list of suggestions for improvements...
1. When you first install it, you can't get into the options, because it won't let you open more tabs!!! I suggest the default number of tabs should be 1 more than the number already open.
2. I also suggest that Firefox options / add-ons tabs should ALWAYS be allowed.
3. I don't like the message that pops up when you reach the tab limit, saying "You have decided not to have more than 23 tabs". It's too long-winded and personal. I'd prefer a simpler, less personal message like: "Maximum number of tabs reached".
4. Sometimes I middle click a link to open it in a new tab, not realizing it didn't work because I'd reached my maximum number of tabs. I think the alert should be much bigger and in the center of the screen, so we don't miss it!
5. Another problem is the way this add-on works. If it STOPPED you from opening a new tab, there would be no problem. But the way it works is to quickly close a new tab that you've opened. This makes you feel as though you've opened a new tab, which can lead to you losing something you were doing, thinking you're on a new tab when you're not. This has happened to me a few times already.
6. Most of the time, I want a limit on how many tabs I can open, but there are occasions when I want to temporarily open a large number of tabs. Therefore, it would be useful to toggle the tabs limit on/off with a simple button on the toolbar.
One feature request that would make this extension perfect for me. Automatically delete tabs based on some kind of LRU ordering.I use a similar extension for chrome and it uses a combination of least recently used and number of times selected to determine which to close and it works great.
I love you so much, this was the last piece of the puzzle stopping me from fully switching from Chromium. I needed this addon because my browsing habits (500+ tabs open) drive me crazy. Thank you! Edit: A clickable popup window accessible from the addons bar would be great for quick changing of maximum tabs, but I still love you nonetheless :)