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You will find the cookie editor under "Tools". As you may guess: it's the one called Cookie Edit. Once you click on it it will pop up a window that looks like this:

On the upper part you have a list of cookies that are in your cookie jar. If you select one of the cookies the lower fields will be filled with the contents of the cookie (domain, path, value and such). You can now modify any of these values and then click on . You're done! Click on "Exit" and your modified cookie will be sent in place of the old one.
As you may see there are other buttond down there. Here is a quick run-down to know what these buttons do.
Decode/Encode: these two buttons will encode and decode the value of the cookie according to the HTTP standard encoding for strings. IE: "/" in the value of a cookie will become "%2F" while encoding, decoding will bring it back to "/". Go on, don't be shy: give it a try! If you screw up don't worry: the cookie won't be saved until you click on "Update", select again the cookie from the list and it will be back in its former glory.
B64 Decode/Encode: it will encode and decode your cookie using the base 64 encoding method. If you don't know what it is, just let your cookies alone an move along. Both kind of encodings (the HTTP one and the Base 64 one) will be applied to the whole value of the cookie unless a portion of the value is selected. In this last case only the selected text of the value will be encoded or decoded.
Create: feeling creative? Just fill in all of the details of the cookie - name, domain, path and value - and press this button, it will be created for you before your very own amazed eyes. Cool, right?

Limitations and bugs

Most of the bugs have been ironed out, and I guess you'll manage to find quickly the ones I haven't seen. Don't be shy: just report them and I'll do my best to fix them. You can't set the duration of the cookie in this version, you'll be stuck with cookies that last 365 days... I think it should be enough. If many people bug me I may add a "duration" field.
Many complain for the lack of a "Delete" button, but you already have that in the standard cookie preferences of Firefox, why add it here? I know: to make you life easier... but then, what would I add for the next version! :)
It may seem annoying having a window alert you every time you change a cookie, but on the other hand it will keep things clear and it gives you a last chance to understand what your cookie will look like. Nope, I'm not too lazy to actually remove the "alert" from the code, I really believe it's a feature!

Thanks

Thanks to my friends and a couple of my colleagues that bothered enough me to fix a couple of bugs and have an almost usable extension. Thanks to the people from my security certification course for showing me that there is some use for the extension. But most of all I need to thank a couple of people who's code is in my extension.
Masanao Izumo: his code is doing the heavy lifting in the base64 encoding/deconding. All the credi goes to him for his javascript implementation of the algorithm. Thanks!
http://www.the-cool-place.co.uk/javascript/tutorial/javascript3.html: this site doesn't exist any longer, but I got the cookie duration routines from here, a long time ago. Kudos to them, whoever they were!

Let me know what you think about it!

MrWHO

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