How do I change the picture in the face bar?
How do I change the picture or colors in the top bar on the screen. It is where the file, edit, view, etc commands are written. It is to dark and I would like to customize it to something lighter.
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The easiest way might be to install a lightweight theme (formerly known as a persona). You can "shop" for one on the Add-ons site. The following link is for solid colors, but some of the pictorial ones might work, too.
https://addons.mozilla.org/en-US/firefox/themes/solid
You can hover your mouse over the little image tile to see how it would look if you installed it. Can you find one that looks good to you?
Much of Firefox's interface also can be modified with style rules. However, that requires a lot more experimentation, so let's come back to that only if needed.
Note that you will only see a preview of a Persona (lightweight theme) if there is an allow exception to install Add-ons (Tools > Page Info > Permissions: Install Add-ons: Allow)