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Firefox's 'About' page seems to lack enough information here. My page just said 'Firefox 39 available' and 'restart to upgrade'. But the exploit page notes tha

Firefox's 'About' page seems to lack enough information here. My page just said 'Firefox 39 available' and 'restart to upgrade'. But the exploit page notes that you need version 39.0.3 in order to be protected. So it's unclear if the upgrade would fix things or not.

tempestn 11y ago
Once you've updated, the About Firefox modal will show you the exact version number you're on.
- ptha 11y ago
  Exactly, I had "Firefox 39 available", once I'd updated and checked "About Firefox", it's version 39.0.3