An Unfinished Symphony

It's about the internet and stuff.

Firefox window resize bug and other annoyances.

A few months ago I asked if anyone had noticed a bug in Firefox that caused the vertical scrollbar to vanish when resizing the browser window to 800 pixels wide. I never received any answers to the question – and I never thought much more about it as it didn’t affect my browsing and I could still test sites at that width, just without a scrollbar. However, after updating to Firefox on Friday the bug mysteriously reappeared, and this time it seemed more severe. This time it was affecting my ability to test sites, and so this time I did a little more than just ask about it on here.

A screenshot of Firefox’s window resize bug in action
Thumbnail view of Firefox's window resize bug in action.
Rather than just losing the vertical scrollbar I now lost the horizontal one too, when one should be there – which would be every time for content that wasn’t fixed to fit in under 800 pixels wide as liquid layouts, such as the one on this blog, failed to resize too.

I did a search on bugzilla to see if there were any previously filed reports and found one dating back to 2003 which has identical symptoms to this one (as in it’s the same bug, 3 years and several browser versions later). It turns out that the problem is a result of the browser incorrectly tying viewport width in with the status bar width, so if your status bar contains a large number of icons, or a series of longer ones, you are likely to encounter this issue. In order to temporarily fix it I’ve had to disable the status bar icons for a number of my browser extensions so that they all fit at an 800 pixel wide resolution. This is far from ideal and diminishes the usefulness of my browser as a development tool, not to mention affecting the single biggest factor (in my opinion) in Firefox’s commercial success – it’s extensibility.

How a bug with such severe outcomes as this can survive for three years and across multiple updates and upgrades I don’t know – perhaps it’s down to its severity being stupidly marked as minor?

On a different note, I also think that the absence of an installation rollback feature for Firefox is a major omission that should be rectified ASAP. At this moment in time the only viable (yet risky) option for repairing a failed install/update, including automatic updates, is to overwrite the existing installation. For example if the install fails due to a corrupt installer package you need to overwrite it with a different copy, or less desirably, a previous version. How come? As mentioned, there’s no rollback feature and system restore often fails to correct the problem – I know, I tried it myself on Friday when the first update attempt left me with nothing more than an empty title bar:

Firefox following automatic update using a corrupt installer package.
Firefox after automatic update used a corrupt installer package.
My less than functional copy of Firefox, consisting of an empty title bar and a non-working close window button.

Fortunately overwriting with a different installer worked, if it didn’t I’d have needed some way of getting hold of an earlier version – not too easy when the Firefox download page only contains links to the latest version and Evolt’s latest archive version is 0.7.1 – the average user wouldn’t think to change the version number in the download URL at Mozilla. Also, I think the idea is for Firefox to not only be a first choice browser, but eventually to become the only choice for the average user? Like Internet Explorer is currently for millions of people – so what would have happened if that was the case? I’d have been left completely browserless and unable to find a way back to Mozilla to download a different copy of the installer package.

These are the kind of issues that Mozilla need to urgently address if they want to see their market share continue to rise, failure to do so could well lead to them losing it. The world is a fickle place and in my opinion the main factor keeping Firefox ahead of Opera at the moment is its extensibility, but even that has lingering flaws as is mentioned above.

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Comments on 'Firefox window resize bug and other annoyances.'

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dehemke says:

I have this same problem with 2.0

bala says:

I too have the same problem,and its kind of irritating when you are doing something important like banking and the popup window becomes unusable..!

Evan Carroll says:

The problem can be recreated by resizing an image (non-html), which was opened with _target=”blank”, and resizing to a smallest window.


It doesn’t look like the issue is going to be fixed any time soon. However, at least for the banking issue, if you have pop-ups open in a new tab instead of a new window you should be able to get by okay.

Isii says:

I have a similar problem on my laptop e.g. when I click on the image at I don’t have this problem on my desktop. Firefox versions ( are same on both. Most extensions are same as well, but not sure if all of them are identical.

John says:

I’ve had this problem for years now. I notice that it frequently happens after I have put my laptop in standby mode.

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