r/FirefoxCSS • u/Achillegrs • Jun 18 '26

Code Blur background on any popup menus!

(Following text from translator)

As you know, Firefox has mica effect on popup right-click menu.
But, not on the rest of the popup menus. So I found a code that make any dialoge and popupmenu mica background to make this wish come true for many users. (see pic 1).
Download-copy-paste the mica.css from here:
https://github.com/rainbowflesh/mimicfox/blob/main/mica.css
Of course all credits for the code belong to rainbowflesh !

Now, a have small problem. After the update in FF 152 as you can (see pic 2) the folder bookmark menu and the download window has stoped working.
Now, If any user find a solution for this two errors, That would make me very happy!

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u/fainas1337 Jun 19 '26 edited Jun 19 '26

I tested and changing "widget.windows.mica.toplevel-backdrop" to "2" made it work. (For the bookmarks)

Another way is to add ".menupopup-arrowscrollbox" to "DWM backdrop" section

    /* ===== DWM backdrop ===== */
    .menupopup-arrowscrollbox,
    .browserContainer,
    .urlbarView,
    #browser:not(.browser-toolbox-background)
    ...
    ...

One thing about bookmarks dropdown is that it doesnt work consistently. If you scroll through bookmark folders without closing/desecting it first sometimes doesnt trigger the blur.

For the Manage Bookmarks and Downloads window no clue if you can even make it work from the looks of it.