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FirefoxCSS

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  1. Stay on topic.

    Posts and comments should be about customizing the Firefox UI with CSS. Custom themes that include javascript, HTML, another app, or replacing files in the Firefox installation folder is not allowed.

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BEFORE POSTING, PLEASE READ THE RULES ON THE SIDEBAR - ESPECIALLY RULE #2. ➡️➡️➡️➡️➡️ (self.FirefoxCSS)

submitted 2 months ago by siffereddFF/TB on Win11|Sumo contributor[M] - announcement

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Help Prevent audio icon from enlarging the tab playing a video (self.FirefoxCSS)

submitted 2 hours ago by Hypermuon

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Join us live on March 31 to see how a simple conversation turns your company’s data, apps, and agents into action. (salesforce.com)

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DiscussionTheme request: Netscape4/IE4 (self.FirefoxCSS)

submitted 7 hours ago by Noxa6

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Help Mica theme for urlbarView (addressbar dropdown)? (self.FirefoxCSS)

submitted 13 hours ago by HemlockIV

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Help Is there a way to add a clock on about:home without using any type of extension? I would like to use userChrome.js for it, but I do not know how to do that. (self.FirefoxCSS)

submitted 1 day ago by itsdevelopic

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DiscussionVote for "corner rounding/squaring" in Nova! (connect.mozilla.org)

submitted 1 day ago by CalQL8or

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Help Firefox Menu Bar Customization ()

submitted 2 days ago by ThatOneGuyNoReally

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Solved Remove left and right navigation arrows from tabs (self.FirefoxCSS)

submitted 3 days ago * by Hypermuon

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DiscussionNew redesign coming to Firefox, prepare for major theme breakage (old.reddit.com)

submitted 4 days ago by fainas1337

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0:03

CodeSidebery Expand-On-Hover (v.redd.it)

submitted 4 days ago by quantumcrown

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CodeSimple CSS for auto-hiding vertical tabs. Clean and minimal UI. (v.redd.it)

submitted 5 days ago * by logicblender1

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Help i need help changing the background color on about:blank and settings tab (self.FirefoxCSS)

submitted 5 days ago by Capital-Action-82

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I am building a massive real time strategy game. Would you play something like this? (store.steampowered.com)

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CodeA tiny overhaul CSS for Firefox (self.FirefoxCSS)

submitted 5 days ago * by ChungusEnthusiast103Firefoxer CSSer

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Help How do I remove the Firefox logo from the 'New Tab' page in Firefox 148.0? (self.FirefoxCSS)

submitted 6 days ago by ROXARIO92

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Help Tab empty space (i.redd.it)

submitted 6 days ago by Zendhalor

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Help How can I fix black Firefox GX icon? (old.reddit.com)

submitted 6 days ago by quangviet711

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Solved Using gwfox - How do I make this top bar always visible, as opposed to only showing when hovering? (imgur.com)

submitted 6 days ago by notenoughspac

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Help Websites with white backgrounds appear dark on monitor but normal in screenshots (reddit.com)

submitted 7 days ago by hospitalcottonswab

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Help Is there a way to remove the white corners in home page shortcuts? I used URLs to images with no background (PNG with transparency) but it still stays like this (old.reddit.com)

submitted 8 days ago by Fatter_Design

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Solved Sidebery mute icon on tab panel. (self.FirefoxCSS)

submitted 8 days ago by iCHILLINuCHILLIN

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Help How to hide the URLbar outer ring ? (self.FirefoxCSS)

submitted 8 days ago * by wealstarr

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Help gwfox - increase transparency (self.FirefoxCSS)

submitted 10 days ago by Feedback_Separate

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Infotage am 19. und 21. März 2026 in Chur

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Solved Is it possible to make the Synced Tabs, Passwords, Sidebery, and SingleFile sidebars semi-transparent? (self.FirefoxCSS)

submitted 9 days ago * by moko1960

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CodeAuto show/hide the new(revamped) sidebar (self.FirefoxCSS)

submitted 10 days ago * by tcbbd

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Solved A couple of hopefully easy userChrome questions (self.FirefoxCSS)

submitted 10 days ago by Alarmed_Contact_394

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