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Default theme displays differently on separate pcs

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We have the latest version of Firefox on two different PCs, on one the default theme gives me dark blue tabs and toolbars and on the other grey tabs and toolbars, does anyone know why?

I would reiterate both are on the Firefox 57 Default theme

We have the latest version of Firefox on two different PCs, on one the default theme gives me dark blue tabs and toolbars and on the other grey tabs and toolbars, does anyone know why? I would reiterate both are on the Firefox 57 Default theme

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Hello, on the default theme -- Firefox 57 uses your chosen Windows 10 border colors for the tabs. To change this change the color in Windows 10 -- or choose the Light theme by going to the 3 line menu >> Click on Customize Firefox >> Themes >> Light.

Did this solve your problem? If so, please mark this as the solution so others may know how to fix it for themselves.