Today, I realize that when developing advanced web applications, we always want to keep an eye on the Javascript console. Ok, in Firefox, there is a little red exclamation mark icon (provided by the Firefox Web Developer Extension, see my article on this topic) when a Javascript error occurs. But if you are not enough concentrated on this exclamation mark icon, you can miss some Javascript errors.

This is a tip (found here) to open the Javascript console on the sidebar:
- Click on the Bookmarks menu and select Manage Bookmarks?
- Click the New Bookmark toolbar button
- Enter JavaScript Console as the name
- Enter chrome://global/content/console.xul as the location
- Check the Load this bookmark in the sidebar checkbox
- Click OK
- Use the created bookmark to open the sidebar

Very useful when developing and testing, isn't it?

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