WebExtensions could use popups and panels in the extension UI to load an "about:" privileged URL, violating security checks that disallow this behavior. This vulnerability affects Firefox < 56.
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{ "availability": "No subscription required", "binaries": [ { "binary_version": "56.0+build6-0ubuntu1", "binary_name": "firefox" }, { "binary_version": "56.0+build6-0ubuntu1", "binary_name": "firefox-dev" }, { "binary_version": "56.0+build6-0ubuntu1", "binary_name": "firefox-globalmenu" }, { "binary_version": "56.0+build6-0ubuntu1", "binary_name": "firefox-mozsymbols" }, { "binary_version": "56.0+build6-0ubuntu1", "binary_name": "firefox-testsuite" } ] }