Never mind, I figured it out. If anybody else is wondering:

• In your URL bar, type "about:config" without the quotes.
• In the "search" bar field up top, type "tabs".
• Look for "browser.tabs.animate". By default, the value is set to "true". Double click on it, which should set the value to "false".

The "false" value should fix the (insanely annoying) tab auto resizing. You can now continue to use Firefox and enjoy tabs without continued frustration.

[relevant image attached]

Hi thebonafortuna,

understand the frustration but currently can not think of an easy non-addon based idea how to resolve this: custom-tab-width

Thanks. I was less concerned with setting my own custom width, and more concerned with disabling the dynamic resizing of tabs.

Fortunately, I was able to successfully solve that frustration with the above solution. It's like night and day: a far more enjoyable browsing experience.

Also, oddly enough, the browser seems to be running perceptibly snappier since disabling animating tabs. I encourage others to try and see if they notice the same.

ok, I was reading it wrong... I have tried to turn off the tab animations in profile as well and tend to like it :D

Thanks for sharing