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blue stripe on top of tab and different default theme color

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hello, So i have been using firefox 57 stable release for a hour and theres a blue stripe on top of the tab that is currently open. i switched to nightly and its still there. I don't know if its supposed to be there but it would mean alot if someone can tell me a way to remove it. also before firefox 57 got released ive been seeing screen shots of the tabs being white and in back of it being black. For me its a really bad looking light shade blue and white tabs. is there any ways to fix this?

hello, So i have been using firefox 57 stable release for a hour and theres a blue stripe on top of the tab that is currently open. i switched to nightly and its still there. I don't know if its supposed to be there but it would mean alot if someone can tell me a way to remove it. also before firefox 57 got released ive been seeing screen shots of the tabs being white and in back of it being black. For me its a really bad looking light shade blue and white tabs. is there any ways to fix this?

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Hi Mozilla_ColdWolf, regarding the tab color scheme, Firefox has three built-in options: Default, Light, or Dark. You could try these out on the Customize tab to see you can find a combination you like. See: Customize Firefox controls, buttons and toolbars.

Regarding the blue stripe on the active tab, that is normal. You can modify the color or make it transparent using a custom style rule in a userChrome.css file:

   .tab-line[selected="true"] {
     background-color: transparent !important;
   }

userChrome.css is an optional file that Firefox reads at startup and applies to the user interface. I recently posted a site with more information about userChrome.css if you haven't worked with it before: https://www.userchrome.org/