Update your browser to fast, safe and secure Firefox. One of the most important things you can do to have a safe, fast and secure online browsing experience is to make sure your browser is up to date. Update your browser like you would update your apps. No matter which browser you use, make sure you’re using the latest version. Download Mozilla Firefox for Windows to plunge into people-first browsing era with impeccably adapted, highly customizable, and safely secured Web experience. Mozilla Firefox has had 9 updates.
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Categories
(Toolkit :: Application Update, defect, P3)
People
(Reporter: jseidel, Unassigned)

I had this same issue for about a year. I finally had enough of having to manually update every few days or so. After searching and trying many different things over several weeks, I somehow came up with this easy solution:
In Firefox Options
General - 'Firefox Updates' section
Uncheck 'Use a background service to install updates'.
I have never again encountered this issue.
Just copied the comment of Mr David Carter as I experienced the same:

I had this same issue for about a year. I finally had enough of having to manually update every few days or so. After searching and trying many different things over several weeks, I somehow came up with this easy solution:
In Firefox Options
General - 'Firefox Updates' section
Uncheck 'Use a background service to install updates'.
I have never again encountered this issue.
Other Languages:
- Stable: http://www.mozilla.org/en-US/firefox/all/
- Beta: http://www.mozilla.org/en-US/firefox/beta/all/
Mozilla Firefox is a fast, full-featured Web browser. Firefox includes pop-up blocking, tab-browsing, integrated Google search, simplified privacy controls, a streamlined browser window that shows a number of additional features that work with you to help you get the most out of your time online.
Installation
Installing Firefox was a fine , quick experience.A new feature checks your add-ons to see which ones you installed and which ones come from third-party vendors, such as security suite makers. The browser will now ask you if you'd like to disable any of these third-party add-ons.
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Interface
The menu bar has been squished into an orange button on the upper left, with menu options spread across two columns.the menu makes it much easier to get to bookmarks, add-ons, and history, as they now all live on one Menu pane.
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Performance
Firefox is built on top of the powerful new Gecko platform, resulting in a safer, easier to use and more personal product.Mozilla plans to crowdsource its performance data to learn more about how the browser performs in real-world situations.
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Features
Firefox's features are robust and generally competitive. The most important feature in the modern Firefox is Sync.Sync now smoothly syncs your bookmarks, passwords, preferences, history, and tabs, not only with other computers, but also with your Android version of Firefox.
