... that Mozilla chose to mess up. I just fixed mine.
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To fix the Firefox address bar to show the complete address (with
http://)1. In the address bar type or paste
about:config
2. In the Filter text input at the top type or paste
browser.urlbar.trimURLs
3. Double click it to change the value to False
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To fix "part of the address is shown in lighter colors"
1. Type or paste about:config in the address bar and press the enter
key on your keyboard
2. In the Filter test input at the top, type or paste
browser.urlbar.formatting.enabled
3. Double click it to change the value to false
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Done!