| Package | Affected versions | Patched versions |
|---|---|---|
| firefox | < 97.0 | 97.0 |
| firefox esr | < 91.6 | 91.6 |
| thunderbird | < 91.6 | 91.6 |
Web-accessible extension pages (pages with a moz-extension:// scheme) were not correctly enforcing the frame-ancestors directive when it was used in the Web Extension's Content Security Policy. This vulnerability affects Firefox < 97, Thunderbird < 91.6, and Firefox ESR < 91.6.
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