@MrOtherGuy

MrOtherGuy@lemmy.world · 1 day ago

You can hide them with userContent.css - most of the devtools window stuff is styled via userContent.css not userChrome.css.

But there’s a catch.

Browser toolbox is essentially a separate instance of Firefox, running in separate profile so your “normal” user css files don’t apply to it. Thus, you need to first enable the toolbox profile to load it’s own user css files and create them just like you do normally (toggle toolkit.legacyUserProfileCustomizations.stylesheets, create files in chrome/ folder etc.). The toolbox profile is stored inside the regular profile - in a directory chrome_debugger_profile.

To get to about:config of the toolbox profile you need to first open a new main-window for it - one way that works is to click the meatball menu at the top-right of the toolbox window, and select “Documentation…” - that will launch a new window using using the toolbox profile and then you can just open about:config and proceed as usual. Or you can just modify prefs.js of the toolbox profile directly while the toolbox is not running.

Anyway, after you have set up the toolbox window to load user css files, then just slap this to its userContent.css and restart the toolbox:

header.chrome-debug-toolbar{
  display: none !important;
}

MrOtherGuy@lemmy.world · 2 days ago

Right, background-color is not an inherited property (compared to for example color (color of text) which is). But even if it were, inheritance is not “enforced” so if website css sets a backround-color specifically for that element then the inherited value would be lost anyway.

But the way you now describe it doesn’t seem possible. There is not syntax to apply style rule to “just the innermost element”. I think the closest would be to have everything else have fully transparent background, but the html root element have only partial transparency:

*{
  background: transparent !important;
}
html:root{
  background: #00000080 !important;
}

However, you will still face a problem; many websites draw graphics or images as a background-image so if you use the background shorthand property then those graphics will be effectively removed. On the other hand, if you instead set just background-color then parts might get opaque again because a website could be drawing even opaque backgrounds as background-image instead of background-color.

MrOtherGuy@lemmy.world · 2 days ago

I think the answer depends on which elements exactly you want to make transparent. The page is a layered structure. The html root element is behind them all. Then body element is on top of that, the rest of the elements on top of body, etc.

So if you intend to have transparency all the way down, then you need to make sure that all the elements in that stack are transparent. If any single item in a stack has an opaque background then the transparency effect stops at that.

As an example, if you set background:transparent to just body but not the document root element, then body will indeed be transparent, but it does not matter because the root will still be opaque. Likewise, if root is made transparent, but there is any opaque layer on top of that, then only the parts of the root element that are not covered by that opaque layer will show up as transparent. If you have a glass table and put a sheet of paper on top of it, then you don’t see through the part covered by the paper even though the table itself is transparent.

MrOtherGuy@lemmy.world · 2 days ago

Yeah, I just figured the safest option would be to only set the actual document root element transparent - in practice I think it’s possibly more likely that the <body> element has background set by the page - although the page might as well set both. So yes, it depends on the website.

MrOtherGuy@lemmy.world · 2 days ago

I don’t think I understand exactly what parts you want to make transparent, but this does work:

set browser.tabs.allow_transparent_browser to true
in userChrome.css add #main-window, #tabbrowser-tabpanels{ background: transparent !important; }
in userContent.css add html:root{ background-color: transparent !important; }

The above would make window background, and the are behind web-content transparent as well as background of html documents - otherwise the background of browser area wouldn’t show up anyway. Toolbars that have their own specified colors would still be colored - which might be opaque or not depending what theme you have selected.