Details why: https://www.mozilla.org/en-US/security/advisories/mfsa2026-45/
Step-by-step instructions:
- open your Firefox application
- choose/click menu "Firefox"
- choose/click menu item "About Firefox"
✓ Firefox is up to date
then you’re all set.
If there is a button that says:
( Check for updates )
then click that.
Or you may see it automatically download an update and see:
- Downloading update — nn.n of nnn MB
- Applying update…
( ↻ Restart to Update Firefox )
then click that!
Aside: #pwn2own is TOMORROW and they hit capacity for the first time in their 19-year history.
https://hackread.com/pwn2own-berlin-2026-hits-capacity-hackers-0-days/
Today’s a good day to get/install OS and browser updates on all your critical devices.
Consider turning off wifi on non-critical devices (putting to sleep is no longer enough because many devices still listen to or contact the internet while asleep) until you have had a chance to safely update their software (perhaps after software updates are available in response to pwn2own demos and disclosures).
#Mozilla #Firefox #browser #cyberSecurity #cyber #security
https://tantek.com/2026/133/t1/update-your-firefox
