Hi, I'm having a problem with 'selected text' style, using userContent.css file with recent Firefox update the next code stop working, seems like Firefox change that behavior:

::selection {
    color: red !important;
    box-shadow: none !important;
    text-shadow: none !important;
    background: blue !important;
}

That code doesn't work in userChrome.css either. Still is possible to change that style? I appreciate any help, thanks.

Using Firefox Beta

Hi, I'm trying to remove the gradient in 'Private mode' new-tab page, I'm trying the next code but without success.

@-moz-document url-prefix(about:privatebrowsing) {
html.private {
        background-color: transparent !important;
        background-image: none !important;
        background: linear-gradient(45deg, transparent, transparent) !important;
    }
}

I also tried:

@media -moz-pref("browser.privatebrowsing.felt-privacy-v1") {
  @media not (prefers-contrast) {
    html.private {
      background: none !important;
    }
  }
}

But with all the gradient don't disappear.

Hi, I could not identify this element to be able to change its color, it appears when you try to move a bookmark, I appreciate any help. 💙

I found a rare variable?: SelectedItem , and I wonder if it is possible to set a new value for it or I should change in every place that variable is used?

/* Autofill (example: login page) focus item background */

.autocomplete-richlistitem {
    &[selected] {
        background-color: var(--button-hover-bgcolor) !important;
    }
}

Testing in Firefox Beta Hi, I had the code to make 'about:' pages (preferences, add-ons) background 'transparent', but with new Firefox changes that code don't work anymore, and I can't find the way to make transparent again, I tried with all the selectors I can but don't work. I enabled browser.tabs.allow_transparent_browser for this purpose, I made them transparent to show the image behind. I would like to solve this issue or maybe is a issue of 'browser.tabs.allow_transparent_browser'

hi, I have the next code to set a smooth transition from the bottom up, of 'tools and extensions', when I set 0px to 'gap' rule, the CPU reach 100% and the PC just die until I remove the code, I think it is caused for the transform rule, I changed the rule: transform: translateY(10px) !important; to a negative value and that solve the issue, but the transition is different, and I want to keep it.

The code is just this:

/* Hide tools except for the last one 'configuration' */

.actions-list[orientation="vertical"]:not(:hover) moz-button[type="icon ghost"]:not(:last-child),
.actions-list[orientation="horizontal"]:not(:hover) moz-button[type="icon ghost"]:not(:first-child) {
    opacity: 0 !important;
    transform: translateY(10px) !important;
    visibility: collapse !important;
    transition: opacity 0.2s ease-in-out, visibility 0.2s ease, transform 0.4s ease;
}

/* Show all tools when 'hover' */

.actions-list[orientation="vertical"]:is(:hover) moz-button[type="icon ghost"]:not(:last-child),
.actions-list[orientation="horizontal"]:is(:hover) moz-button[type="icon ghost"]:not(:first-child) {
    opacity: 1 !important;
    transform: translateY(0px) !important;
    visibility: visible !important;
    transition: opacity 0.2s ease-in-out, visibility 0.2s ease, transform 0.4s ease;
}

.tools-and-extensions[orientation="horizontal"] {
    gap: 0px !important;       
}

Test it in Firefox-developer-edition Using just this code:

#tabbrowser-arrowscrollbox[orient="horizontal"] {

    /* Horizontal tab size */        
    &>.tabbrowser-tab[fadein]:not([style^="max-width"]),
    &>tab-group:not([collapsed]) .tabbrowser-tab[fadein]:not([style^="max-width"]) {
        max-width: 200px !important;
    }
}

For some reason, after some steps, the tab with 'sound-muted-blocked' becomes larger when moving other tab, I made a video showing the problem, hope someone can share a better code or a solution, the problem was in the previous developer version but with an update the problem didn't appear anymore, I guess the developers remove some change but with the new developer-version v.142.b2 those changes were added again.

Video showing the problem: https://imgur.com/a/jeR2zN7 don't pay attention when the YouTube page is loading, my pc is a potato.