eldk edited a comment on issue #1857: firefox 65 png and gif files do not convert to webp, though jpg does. URL: https://github.com/apache/incubator-pagespeed-mod/issues/1857#issuecomment-480599291 Hello, I've just checked webp request with Firefox 66.0.2/Ubuntu 16.04 : images requests have been changed from `Accept: image\webp` to `Accept: image/webp,*/*`. I think It's a Firefox regression. Curl with Firefox 66.0.2 original headers, `Accept: image/webp,*/*`, get jpeg pictures. Curl with Firefox 66.0.2 modified headers `Accept: image\webp` as it was in Firefox 65, get webp pictures. I think a bug must be filled at https://bugzilla.mozilla.org/show_bug.cgi?id=webp Thanks, Eric
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