Earlier today saw Mozilla release Firefox 44 and Firefox ESR (Extended Support Release) 38.6. This release sees the end of support for the RC4 cipher. This was also discussed in a previous blog post of mine. For details of the new features added to Firefox 44, please see this release notes page.
Firefox 44 resolves 17 security issues more formally known as CVEs (defined). Individually the severity of these issues are as follows:
6x critical severity CVEs
3x high severity CVEs
7x moderate severity CVEs
1x low severity CVE
Meanwhile, Firefox ESR 38.6 resolves 4 security issues:
3x critical severity CVEs
1x moderate severity CVE
Full details of the security issues resolved by these updates are available in the following links:
Details of how to install updates for Firefox are here. If Firefox is your web browser of choice, please update it as soon as possible to resolve these security issues.
In general, Mozilla Firefox updates install without issues, however as always I would recommend backing up the data on any device for which you are installing updates in order to prevent data loss in the rare event that any update causes unexpected issues.