WebExtensions in Firefox < 51 could use the mozAddonManager API by modifying the CSP headers on sites with the appropriate permissions and then using host requests to redirect script loads to a malicious site. This allows a malicious extension to then install additional extensions without explicit user permission.
WebExtensions in Firefox < 51 could use the mozAddonManager API by modifying the CSP headers on sites with the appropriate permissions and then using host requests to redirect script loads to a malicious site. This allows a malicious extension to then install additional extensions without explicit user permission.
https://www.mozilla.org/en-US/security/advisories/mfsa2017-01/#CVE-2017-5389 https://bugzilla.mozilla.org/show_bug.cgi?id=1308688
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