The storage backing for Application Cache has been completely disabled starting with Firefox 84 [1]. That means the current window.applicationCache object is not really useful and only exists for backward compatibility. The plan is to remove it.
We intend to do this in two stages: First we disable the API for Nightly and Early beta [2] followed by an eventual disabling and removal in Release [3]. The removal in Release is expected to happen after Chrome's origin trial is completed [4]. The risk associated with removing this API is slightly higher than with disabling the storage from appCache due to the greater chance it could cause JS exceptions to be thrown if websites don't check if the API exists. However, we have successfully unshipped this from insecure origins in the past so we don't expect major issues. The current use stats for the window.applicationCache in Beta 86 (2021/01/25 - 2021/02/17) are as follows: 018.91B (99.51%) - Not used 1244.32M (0.49%) - Used [1] https://bugzilla.mozilla.org/show_bug.cgi?id=1619673 [2] https://bugzilla.mozilla.org/show_bug.cgi?id=1677719 [3] https://bugzilla.mozilla.org/show_bug.cgi?id=1677718 [4] https://web.dev/appcache-removal/ _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
