The recommended way to install user styles is to use Firefox with Stylish.
If you already have Firefox with Stylish, make sure this site is allowed to run JavaScript.
You've installed this user style in Stylish. To uninstall it, open the Tools menu, choose Add-ons, click the User Styles panel on the top, click on the entry for this user style, and click Uninstall.
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You've installed this user style in Stylish. To uninstall it, open the Tools menu, choose Stylish, and remove the entry from there.
You've installed this user style in Stylish, but a newer version is available.
To uninstall this user style, open the Tools menu, choose Add-ons, click the User Styles panel on the top, click on the entry for this user style, and click Uninstall.
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The recommended way to install this user style is to .
It's not 100% identical (there are still a few things that need to be worked on like the filter section doesn't look right and the buttons and search box are not styled) but it should stop the page jumping about when the page is loading.
Again... I did not make this, I just copied the css from Sean's script and put it in this stylesheet.