In this case, obfuscated JavaScript in a web page could have been booby-trapped so that a developer trying to debug it might inadvertently load privileged content such as the contents of local files. SourceMap tries to reverse this obfuscation in order to make bugs and rendering problems easier to spot. Many JavaScript programs sent over the internet are deliberately sent in non-human-readable form, sometimes as a way of making them harder to figure out, but often simply as a way of squashing them up to save download space and time. The SourceMap tool in Firefox isn’t intended for everyday use – it’s a feature that’s useful for developers wanting to dig into the JavaScript source code of a web page to see why it’s misbehaving.
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The full list of fixes for this release can be found in Mozilla’s Security Advisory 2022-13. (Alternatively, simply quit Firefox and launch the app again.)
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If an update is needed, don’t forget to click to activate the new version. If you’re already up-to-date then the dialog will tell you, otherwise it will fetch the latest version. In particular, although Mozilla admits that some of the memory management bugs that were fixed in Firefox 99.0 might be exploitable “with enough effort”, no working exploits are yet known.Īnd with no known exploits at all, clearly there are no known exploits that were already being used the Bad Guys, or zero-days as they’re called in the jargon.ĭespite the apparently low risk this month, all security holes bring with them some danger, or they wouldn’t be given CVE bug numbers and listed in security advisories, so we recommend updating as soon as you can.Ĭlick the Menu button (three lines) at the top right of your Firefox window, then click Help, and select About Firefox.
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99.0.)įortunately, as in the April 2022 Google Android update we just wrote about that happened to arrive on the same day, there were no critical security fixes and no zero-day holes patched.
(Thus, 91.8 ESR has the feature set of Firefox 91.0, plus the same 8 sets of four-weekly security patches that came out in the intervening full releases, thus aligning it security-wise with version (91+8).0, i.e. The regular version of Firefox is now 99.0, while the Extended Support Release, which gets security fixes without any feature updates, is now 91.8.0 ESR.Īdd together the first two numbers in the ESR release triplet and you should get the same value as the first number in the regular release. The once-every-four-weeks security update to Mozilla’s Firefox browser officially arrived today.