You want to send custom headers on every request. This is the way

I needed to use it only for a short time. Did what it promised.

ok, would give 5 star because is the best around but,

- High appreciate the use of Regex and the filtering,
- configuration panel is slow it should use an entire page and remain open instead to have that little window
- json export is precious to save your configurations

The more you dig into its options, the more you reliaze it's exactly what you were looking for.

Very useful for web development.

Works as advertised, useful for debugging

Good tool,thanks.

Дозволяє додавати власні хедери, створювати профілі, фільтри, робити бекапи профілів в клауді.

Really good:
i tried a lot of different 'overrated' extensions: no one BUT THIS SIMPLE ONE was able to 'Accept-Language' with the proper Locale

Exactly what i was looking for... same as the chrome extension !

Best Header editor

Finally an extension on Quantum that effectively blocks X-Frame Options allowing me to use Adobe Target in Firefox again - simple to use, does exactly what it promises.