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Add top border to inacytive tabs

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  • Last reply by PCZero

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What is the entry I need to add to usechrome.css to add a border to the inactive tabs in FireFox? With the default configuration, the inactive tabs blur into the menu bar. When hovered the inactive tabs changes to a darker grey and has the border added. I'd like to add the bored to all inactive tabs whether hovered or not.

What is the entry I need to add to usechrome.css to add a border to the inactive tabs in FireFox? With the default configuration, the inactive tabs blur into the menu bar. When hovered the inactive tabs changes to a darker grey and has the border added. I'd like to add the bored to all inactive tabs whether hovered or not.
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Chosen solution

If you aren't looking for something that has the tab shape, just a solid line, you could add a background color on the tabs "behind" the tab line element. This uses a linear gradient (top to bottom) to start gray and switch to transparent after a few pixels:

.tabbrowser-tab {
  background-image: linear-gradient(rgba(0,0,0,.2) 3px, transparent 1px, transparent 99%);
}


Two notes:

(1) I tested with the Light theme; this color probably won't work well on other themes.

(2) I think it's a little more attractive if the top line is thinner. For example, 2 pixels on the gray band:

.tabbrowser-tab {
  background-image: linear-gradient(rgba(0,0,0,.2) 2px, transparent 1px, transparent 99%);
}
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All Replies (3)

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Looks this is done via this CSS code:

.tabbrowser-tab:hover > .tab-stack > .tab-background > .tab-line:not([selected=true]):not([multiselected]) {
  background-color: rgba(0,0,0,.2);
  opacity: 1;
  transform: none;
}

To apply this code for all tabs you can try:

.tabbrowser-tab > .tab-stack > .tab-background > .tab-line:not([selected=true]):not([multiselected]) {
  background-color: rgba(0,0,0,.2) !important;
  opacity: 1 !important;
  transform: none !important;
}
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Seçilmiş Həll

If you aren't looking for something that has the tab shape, just a solid line, you could add a background color on the tabs "behind" the tab line element. This uses a linear gradient (top to bottom) to start gray and switch to transparent after a few pixels:

.tabbrowser-tab {
  background-image: linear-gradient(rgba(0,0,0,.2) 3px, transparent 1px, transparent 99%);
}


Two notes:

(1) I tested with the Light theme; this color probably won't work well on other themes.

(2) I think it's a little more attractive if the top line is thinner. For example, 2 pixels on the gray band:

.tabbrowser-tab {
  background-image: linear-gradient(rgba(0,0,0,.2) 2px, transparent 1px, transparent 99%);
}
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Thank you both for your responses. Very helpful. I opted for the following...

.tabbrowser-tab {

 background-image: linear-gradient(rgba(0,0,0,.2) 1px, transparent 1px, transparent 99%);

}

This gave me exactly what I want/need! Very much appreciate your assistance.