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There is very little doubt that the Firefox British dictionary will produce more spelling errors than Safari. Moreover, the Firefox extension in no way offers auto suggestion, much less actual auto-correction.
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It fails to take a stand on some of the most basic Trans-Atlantic spelling differences. If you type any word which is not present in the Firefox dictionary then you would get the red underline as we mentioned. The Firefox extension by Mark Tyndall (version 1.19.1) is not so good. How to add a new word to the spell checker. Global British spelling in Mac OS X is really solid and complete.
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This Firefox fix is not nearly as good as Safari's British spell checking abilities. However, we strongly recommend that if you have a Mac, you should only edit in Safari. If you have a version lower than 14.0.1, you can still follow this installation guide, but you will want to instal version 1.19(.0) of the Mark Tyndall add-on, instead, which can be found here. However, since the add-on is platform neutral, this tutorial applies to Windows and Linux users, too. The following instructions were verified as working in Firefox 14.0.1 for Mac. This tutorial explains how to instal Mark Tyndall's British English Dictionary add on, version 1.19.1 into Firefox 14.0.1.
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