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Help with Firefox CSS

Hi I'm trying to switch from Opera-GX and someone recommended Firefox-GX CSS on git hub and I was just wondering this safe to add on?

100万平方メートルに及ぶ緻密に再現された街並みを自由に探索できます。
  • 100万平方メートルに及ぶ緻密に再現された街並みを自由に探索できます。
  • 100万平方メートルに及ぶ緻密に再現された街並みを自由に探索できます。
  • 100万平方メートルに及ぶ緻密に再現された街並みを自由に探索できます。
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    Kupfel

    Sure. CSS is just CSS. It can only change or hide visual stuff and can not change functionality.

    Just keep in mind that by using such a complex CSS project you're sort of reliant on them fixing stuff if stuff breaks with subsequent changes caused by new firefox versions unless you're proficient in CSS yourself.

    2
    [deleted]

    Yeah I have no idea how to do any programming I just liked Opera-GX UI so that's why I was looking into this do you have a better recommendation cause seeing I can't change my background is kinda making me want to go back to opera

    1
    Kupfel

    I mean if you really like the Opera-GX theme then you might as well try out that theme. Can always remove it again if you aren't happy with it or change to something else.

    By background, do you mean the new tab background?

    If it's just that then that's really simple to change with CSS.

    First set up and enable the use of userChrome.css and userContent.css

    Then put that into userContent.css: 

    @-moz-document url(chrome://browser/content/browser.xul), url(about:newtab), url(about:home) {
    body {
        background: url(background.png) !important;
        background-size: cover !important;
        background-position: center !important;
    }
}

    Put the desired wallpaper into the chrome folder together with userContent.css and then replace background.png in the code to the name/extension of your wallpaper. Then restart Firefox and done.

    For CSS themes I personally like these two: FF-Ultima, potatofox

    For regular firefox theme I like this one: Dark space

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