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How do you stop Firefox from automatically updating itself?

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How do you stop FF from automatically updating to the latest version? I need to keep FF at version v37, but it keeps updating to v39 no matter what I do. I have gone to options -> advanced -> updates and deselected automatic updates. I've also gone to about:config and changed app.update.auto to false.

But it is still updating. This is extremely frustrating because I have to keep uninstalling and re-installing but it keeps updating itself. Thanks in advance

How do you stop FF from automatically updating to the latest version? I need to keep FF at version v37, but it keeps updating to v39 no matter what I do. I have gone to options -> advanced -> updates and deselected automatic updates. I've also gone to about:config and changed app.update.auto to false. But it is still updating. This is extremely frustrating because I have to keep uninstalling and re-installing but it keeps updating itself. Thanks in advance

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There is a way to disable updates by going through the Options menu but after disabling it through there, when you would go to Help > About Firefox, it would update regardless of that setting. 2 methods here, pick one. You can set these prefs in about:config to disable automatic updating: app.update.auto - false app.update.enabled - false app.update.silent - false Or you can use this method to do that for you: You can create a new file in a text editor (Defaults are: Notepad for Windows, TextEdit for Mac, and Text Editor on Linux) called user.js. When you save user.js, make sure it's file type is ALL FILES as leaving it like that will add the .txt extension (user.js.txt) and it won't work. Place this file in your Profile Folder. See the link below to learn how to access the folder

How to find my profile Folder Once you're creating the folder simply add the following to your user.js file, save and close, restart Firefox

// turn off application updates: user_pref("app.update.enabled", false);