If you’ve just eagerly updated to Firefox 3, only to find that you can’t use certain vital extensions like the Web Developer toolbar and User Agent Switcher, read this useful post and then restart Firefox to fix the “plugin does not provide secure updates” message.

Further to my previous post about Search Engine Optimizer essentials, there are a couple of additional tweaks you can make to your Firefox installation to make it more useful for SEO purposes.

Custom Stylesheet

1. Find your /Profiles/{xyz}.default/chrome/ directory
2. Rename userContent-example.css to userContent.css and open it in your favourite text editor
3. Add in the following rules:

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