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I am using Firefox 4.01 on GNU/Linux x86_64.

Is there any reason why there is no autoupdate? In fact, when I look at the "About Firefox" dialog, it just says "Updates available at".

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Long story short: Install it manually (unless it comes with your Linux package management, thanks Simon Sheehan for pointing that out)

First of all,

Firefox 4's silent update will only be offered on Windows, Mozilla has said.1

however that applies only to security updates I suppose. That is backed up by the following statement:

We are treating the automatic update checkbox enabled as a 'Yes, I want Mozilla to keep me updated. Previously as a courtesy we had people opt-in between major versions due to the potential jarring nature of the update. We feel the difference between 3.5 and 3.6 is not severe and with 3.5 reaching end-of-life 3.6 is the security update for 3.5 users. 2

This has been the process for all major Firefox version before, as they're not an important Security Update per se but a manual update you can choose to make.

On June 21, the day Firefox 5 is supposed to ship, Mozilla will automatically push Firefox 3.6.18 -- a standard security update -- if the company resolves a few remaining bugs. If those bugs don't get fixed by then, the auto-update will hit Firefox 3.5 users some time later.

So no mentioning of automatically updating the major version here as well.

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If you are using a distro with a package manager, many such as ubuntu, Suse, Fedora, etc, should be shipping it via their package managers now. – Simon Sheehan Jun 22 '11 at 14:29
Thanks @Simon for the addition. – slhck Jun 22 '11 at 14:30

The auto update is only for minor releases 4.1 4.2

"We'll only be using the major update dialog box for changes like 4 to 4.5 or 5."

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