# Mozilla Firefox Addon

**URL:** <https://discourse.mozilla.org/t/mozilla-firefox-addon/29355>\
**Category:** addons.mozilla.org\
**Tags:** learning\
**Created:** [June 13, 2018, 9:53am UTC](https://discourse.mozilla.org/t/mozilla-firefox-addon/29355 "2018-06-13T09:53:16Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![pbjsowon408](https://avatars.discourse-cdn.com/v4/letter/p/ea5d25/32.png) [@pbjsowon408](https://discourse.mozilla.org/u/pbjsowon408)\
**Post date:** [June 13, 2018, 9:53am UTC](https://discourse.mozilla.org/t/mozilla-firefox-addon/29355/1 "2018-06-13T09:53:16Z")

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Is there theme changing addon for various colors? Addons that exists in the firefox are only providing the simple colors such as black and white.

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**Author:** ![jscher2000](https://sea1.discourse-cdn.com/flex001/user_avatar/discourse.mozilla.org/jscher2000/32/28202_2.png) [@jscher2000](https://discourse.mozilla.org/u/jscher2000)\
**Post date:** [June 14, 2018, 6:56am UTC](https://discourse.mozilla.org/t/mozilla-firefox-addon/29355/2 "2018-06-14T06:56:26Z")

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Are you creating a popup that appears below the toolbar? As far as I know, you can use any colors you like in your CSS.

If your system has a “high contrast” theme, however, Firefox may simplify the colors in your popup as it does in web content. I’ve never tested that.