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Why are all tabs and urlbar colors slightly off?

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riccardo.mazzarini98
riccardo.mazzarini98
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I'm customizing Firefox's look via a userChrome.css file. The only thing I have in my userChrome.css is the following

/* Focused tabs color */ .tab-content[selected="true"] { 

 opacity: 1.0 !important;
 background-image: none !important;
 background-color: #797979 !important;

}

which should change the selected tab's background color to #797979.

However, if I check the colors with an external tool (Digital Colour Meter for macOS) I can see that the selected tab's background color ranges from #747474 to #797979, when I'd expect a uniform #797979.

Why am I seeing these inconsistencies?

I'm customizing Firefox's look via a userChrome.css file. The only thing I have in my userChrome.css is the following /* Focused tabs color */ .tab-content[selected="true"] { opacity: 1.0 !important; background-image: none !important; background-color: #797979 !important; } which should change the selected tab's background color to #797979. However, if I check the colors with an external tool (Digital Colour Meter for macOS) I can see that the selected tab's background color ranges from #747474 to #797979, when I'd expect a uniform #797979. Why am I seeing these inconsistencies?