Vulnerabilities

If a valid external protocol handler was referenced in an image tag, the resulting broken image size could be distinguished from a broken image size of a non-existent protocol handler.

When multiple WASM threads had a reference to a module, and were looking up exported functions, one WASM thread could have overwritten another's entry in a shared stub table, resulting in a potentially exploitable crash.

When a link to an external protocol was clicked, a prompt was presented that allowed the user to choose what application to open it in.

Mozilla developers and community members reported memory safety bugs present in Firefox 81 and Firefox ESR 78.3.

Mozilla developers reported memory safety bugs present in Firefox 81.