Two high, two moderate and one low impact security issues are also fixed by the release.
Other bug fixes address problems relating to stored passwords and saving proxy settings.
Additional changes include miscellaneous stability improvements, an updated version of the Public Suffix list, and support for additional EV (Extended Validation) root certificates.
Icelandic and Thai are now officially supported, with beta support for Bulgarian, Esperanto, Estonian, Latvian, Occitan and Welsh. A user interface issue relating to Japanese, Korean, Chinese and Indic has also been fixed.
Firefox 2.0.18 is a security update only, as Firefox 2 is no longer being developed and support is scheduled to end next month.
It fixes six critical issues, along with three high, one moderate and one low impact vulnerabilities. Some of the fixes are common to Firefox 2 and 3.
The updates can be obtained by using Firefox's built-in updating mechanism, or by downloading new versions of the browser from www.getfirefox.com