I wrote a little webext to help me find tabs in a visual way grouped by window. middle click closes the tab and left click brings the tab you click on to the forefront. It's simple but something I use many times every day.

feel free to try it out:

https://addons.mozilla.org/en-US/firefox/addon/tabist/

https://chrome.google.com/webstore/detail/tabist/hdjegjggiog...

https://github.com/fiveNinePlusR/tabist