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, >With Firefox 66.0.2 none of the images get converted to webp, despite the browser send image/webp header The main changes are in default accept header value: - about:config network.http.accept.default seems to have been removed from default Firefox conf - default accept header have been changed from : `text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8` to `text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8` cf : https://developer.mozilla.org/en-US/docs/Web/HTTP/Content_negotiation/List_of_default_Accept_values Therefore, in html embedded pictures are served as jpeg. I think a bug must be filled at https://bugzilla.mozilla.org/show_bug.cgi?id=webp Thanks, Eric Related to this : - https://developer.mozilla.org/fr/docs/Mozilla/Firefox/Releases/66#Networking - https://bugzilla.mozilla.org/show_bug.cgi?id=1417463 - https://bugzilla.mozilla.org/show_bug.cgi?id=1532223
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