Thick border line between TST and websites?

[mfn]

Hi 👋🏼

since the/a recent update I notice thick(er) border line:

This wasn't there before.

I'm using Firefox 143.0.1 (aarch64) on macOS 26.0

I could not find any setting nor do I use custom User Style Sheets. I also searched the github issues and discussions, but couldn't find anything.

Any idea how to make it thinner?

thanks!

[irvinm]

I tried changing this while in the browser toolbox and it worked.

It looks like you can just do this in your userChrome.css however you want to customize it. It looks like the default is 4px if you do not have sidebar.revamped = true in your about:config.

.sidebar-splitter {
	--splitter-width: 4px !important;
}

[mfn]

I didn't realize.. so you are saying, this does not come from TST but from Firefox itself?

Indeed, the border is also there when I open the bookmark sidebar.

Oh well, in that case, I guess it's fine.

Sorry, I thought it was related to TST as it's the only one I have open and it suddenly changed.

Thank you!

[irvinm]

Correct ... this is Firefox specific, not TST related.