[pepve]

You can edit cookies with the "Developer Toolbar". It's under "Tools -> Web Developer" and reachable with the shortcut "Shift+F2". It's not brilliant but it works well.

[awalGarg]

I second that. The GCLI is pretty awesome. It is a huge work in progress but still works pretty neat.

Here is the entire documentation: https://developer.mozilla.org/en-US/docs/Tools/GCLI#Commands (links to list of commands, I suggest reading the entire page).

The best part is that it is extensible (Scratchpad FTW!) :)

[_jomo]

The 'security' command is also a really nice tool to tweak your page: https://developer.mozilla.org/en-US/docs/Tools/GCLI/Display_...

[vital]

Nice! Thanks. New to me. Still, considering how "not brilliant" this feature is, I'd rather use Chrome dev tools when cookie editing/deleting is needed.

[mmebane]

Chrome doesn't have the ability to edit cookies built-in, either, does it? All I can find is viewing and deleting.