Haven't found fault so far. Brilliant add on. I wish it had auto complete/suggest on the header values, like it does for header names. That's my only critique so far.

Love this extension,

Clean interface. It works very well. Thank you

Nice extension. I always looked for something like that and the firefox options didn't fit my needs. I know it still can be improved but, compared to my previous attempts, this one is great.
Thanks Espen H, keep up the good work.