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If no image is specified the website's favicon will be used instead. This add-on provides a preferences window where you can define a URL, Image, and Toolbar ID - being the two later optional. So, this restartless and lightweight add-on (4KB code, 8KB package) should make things nicer for those of you who like to use them. I think the least to say is that these just causes an unnecessary Firefox startup overload if you have a few of them. I'm personally tired of those bloated add-ons which serves no purpose other than providing just a bookmark-style button on the add-ons toolbar.
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