That's not going to be possible with CSS since the urlbar input box is ultimately a html <input> element, width of which can't depend on the contained value alone. You'll need custom javascript that sets a width for the input box every time something is entered to the input box, and also whenever the text in the input box changes for whatever other reason so it's not exactly trivial.
this post was submitted on 03 Jul 2023
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Firefox CSS
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Pushing the limits of the Firefox Browser through the use of CSS.
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That is way above my league. I guess I'll settle on having URL text centered. Thanks. This is what it looks like so far:
