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Remove (Build....followed by numbers) in my Browser Bar

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I recently noticed that when I open a Firefox Browser, at the top, where it says "Mozilla Firefox" it is followed by this: (Build 2097109189239018)

Those are not the actual numbers, but that is what it looks like - Parenthesis with the word "Build" followed by a series of numbers and then the end parenthesis.

I would like to get rid of this please. I don't want to see it.

What is it first of all? Why is it suddenly appearing in my browser bar? And HOW can I get rid of it once and for all?

Thank you!

I recently noticed that when I open a Firefox Browser, at the top, where it says "Mozilla Firefox" it is followed by this: (Build 2097109189239018) Those are not the actual numbers, but that is what it looks like - Parenthesis with the word "Build" followed by a series of numbers and then the end parenthesis. I would like to get rid of this please. I don't want to see it. What is it first of all? Why is it suddenly appearing in my browser bar? And HOW can I get rid of it once and for all? Thank you!

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Sounds like the Nightly Tester Tools add-on.

https://wiki.mozilla.org/Auto-tools/Automation_Development/Projects/Addons/NightlyTesterTools

Change the prefs for Customize Titlebar in Firefox app button > Nightly Tester Tools - > Customize Titlebar

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Please Update to the latest Firefox 17.0.x version.

  • Help > About Firefox

The Firefox Firefox 12.0 version that you currently run is no longer supported with security updates