You aren't using code in userChrome.css that could cause this because pinned tabs set the text label width to 0px, so you should never see text ?

.tab-label-container[pinned] {
    width: 0;
}

Thanks for the pointer! My userChrome.css looked like this and it turns out the last part caused the isssue...

``` @namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");

/* Use the full titlebar for tabs */ .titlebar-spacer[type="pre-tabs"] {

 width: 13px !important;
 max-width: 13px !important;

} .titlebar-spacer[type="post-tabs"] {

 width: 0px !important;
 max-width: 0px !important;

}

/* Always show the close button when hovering over a tab */ .tabbrowser-tab:not([pinned="true"]):hover .tab-close-button:not([selected="true"]) {

 display: -moz-box !important;

}

/* Do not show the blue tab line */ .tabbrowser-tab .tab-line {

 display: none !important;

}

/* Prevent tab overflow */ .tabbrowser-tab {

 min-width: initial !important;

} .tab-content {

 overflow: hidden !important; ===> this cause the issue

} ```

After removing the last 3 lines it all works again, but if I open a lot of tabs I do get the overflow again. Do you know another way to prevent that?

Thanks for your help!!

Well it actually fine without those 3 lines. It does overflow, but only when I have way more tabs open then I should. So I'm good with just removing the three lines and leaving it like that.

Thanks again!

In what way does it overflow?

Can you attach a screenshot ?

• https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem
• use a compressed image type like PNG or JPG to save the screenshot

Thanks for the follow up, but its really not needed. I happy with my config again and it only overflows when there are way too many tabs open. So I'm good!

For reference I'm talking about this behavior (tab scrolling/overflow, not sure what to call it): https://www.reddit.com/r/firefox/comments/b3slhs/why_is_there_absolutely_no_possible_way_to/

I used the solution described in there which worked... Until now that is :)

What I do see now is that when I hover over a tab it resizes to show the tab-close-button. It didn't use to do that and if I put the 3 lines back it doesn't anymore.

So fixed one, but introduced another ;)

Adding the 3 lines back with a small adjustment made it work as expected again:

.tab-content:not([pinned="true"]) {

 overflow: hidden !important;

}

Thanks again for your help!