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URL bar magnification

  • 3 replies
  • 1 has this problem
  • Last reply by ARMAN KHAN

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When i open the browser the URL bar enlarges instatlly. I am good looking, but not that much. How can it be disabled?

moderator edited the Title of this question thread

When i open the browser the URL bar enlarges instatlly. I am good looking, but not that much. How can it be disabled? ''moderator edited the Title of this question thread''

Modified by the-edmeister

All Replies (3)

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hello Antal Robert,

follow the steps and instructions.

type about:config in url bar then type browser.urlbar.update1 (previously known as browser.urlbar.megabar).

Setting that to false will revert the bar to its more typical behavior in new windows (the windows that are already open seem to keep the megabar behavior until the next session).

For anyone unfamiliar:

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button accepting the risk.

(2) In the search box above the list, type or paste URLB and pause while the list is filtered

(3) Double-click thebold text browser.urlbar.update1 preference to switch the value from true to false

Note: This preference does not exist in Firefox 71-72.

I hope resolved your problem then reply back to me.

Thank you !

regards, Ar

Arman khan

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Arman, thank you for your solution, but it seems that doesn't work for me.

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hello (again) Antal Robert

now please try it this way:

(For anyone who already has a working userChrome.css file set up, you just need to add the rules you downloaded under (A) to your file.)

(A) Download a rules file


Use the downloads list on the toolbar to open the downloads folder directly to the new userChrome.css file. (See attached screenshot)

Minimize that file browser window for later reference.

(B) Create a new chrome folder in your profile folder

The following article has the detailed steps for that (#1, #2, and I recommend #3)


have videos for both Windows and Mac in case the text is not clear.

(C) Move the userChrome-ZeroEnlargement.css file you downloaded in Step A into the chrome folder you created in Step B

(D) If you do not already have a userChrome.css file, Rename the userChrome-ZeroEnlargement.css file

Highlight userChrome-ZeroEnlargement.css and choose Rename (using whatever method Finder offers). Carefully remove -ZeroEnlargement and press Enter to save your change. The final file name needs to be userChrome.css or Firefox will never find it.

(E) Set Firefox to look for userChrome.css at startup -- see step #6 in the above article.

The next time you exit Firefox and start it up again, it should discover that file and apply the rules.


Once you start tweaking the interface this way, you'll probably find more and more things you want to do. I suggest bookmarking the pages where you get the code for future reference because changes to Firefox may break them and it's easier to request an update if you can find the source.

Thank you!