Simple and easy. Works as expected.

Works like a charm! Thank you!

El único problema es que no funciona en modo privado.
Una sugerencia sería un botón de "Aceptar" al lado del cuadro de texto.

I have tried everything I can think of for changing the accept-language of Firefox, but it seems to be stuck on en-GB. I've changed the locale of my system to en-US but Firefox still sends out en-GB. I tried your addon to fix it and it still wont change. I will be willing to give higher marks if you can show that your addon is fine and that it's something else.

Yeah your addon is just fine I think. I'm blaming this one on MOZILLA FF. the addon wasn't changing anything in the accept-language field until I changed "en-US,en" to just "en-US"

FF is kinda shoddy like that.

Работет. Гут

Exactly what I was looking for.

It works and I can finally access a specific website in the language I require. I would like an interface which lets me set different locales for different websites.

However, it is sufficient for my rare need to access this website and it helped me a lot. Thank you.

Wow! It's just what I was looking for. Thanks!

very handy. Hotkeys would be welcome though!

This works well, on some tabs. On other tabs, it doesn't change the Accept-Language header at all. Maybe there is a e10s-multi incompatibility?

Works as advertised in Firefox 53.0 after the author pushed a bug fix. See https://github.com/callahad/quick-accept-language-switcher/issues/4.

Presentation for handling things like "q=0" (disallowed languages), multiple accepted languages, and invalid header strings could be improved, but those issues are merely cosmetic.

Firebug still shows Accept-Language
en-US, while I set "fr". FF52. Seemed simple and right tool, but does not work.

And it is open source :-)

Does exactly what I wanted, thanks for the great work

And ability to add presets to the options for needed combinations. Use that presets in the drop-down menu.