Works great. Thank you for solving this annoyance!

This addon is a dream that comes true for anyone who hates webp. :)

Fundamentally, I like webp, but display considerations have to be accounted for. Irvanview64, with all the plug-ins installed, still doesn't play webp for me, and if I transfer images to my phone, I'm not sure how they'll display there. I asked r/firefox on reddit, and this extension got two quick recommendations. I tested it on Vanity Fair and the images I saw in webp were now jpegs. It works, and that's all I can ask for.

Soooo helpful. Part of my "essential add-ons" after installing a browser.

Works exactly as advertised. Various websites including Reddit appear to have stopped sending me webP images. I have experienced no side-effects or problems.

Works as expected, and allows me to reject Google's WebP format, and save images in JPG and PNG format again. Thanks!

I have image.webp.enabled set to false, I have image/webp;q=0 in my image.http.accept, but sadly some web sites still tried to shove this Google crap down my throat…
With this extension — not anymore!

WebP and other "open" formats and codecs by Google shouldn't exist in the first place.
Thank you for doing god's work with this extension!

Good initiative. Webp is a crap.

WEBP is the worst image container format ever invented. thank you for allowing us to block them.

100% :)

This works immediately. Thank you so much!

Thank you so much for this add-on. I could rant all day about how the webp and the gifv formats are a pain in the ass. But I am surprised not a single image application is adding support for these formats. Not counting MS Paint which seems to do webp. How did all these sites suddenly add support for these formats when no editors have? Until I can view these files in my Directory Opus and ACDSEE and can freely convert from one to another I don't need or want it.
Again! Well done on this addon