Overview:
Mozilla has released three security advisories recently to patch the multiple vulnerabilities existing in its products, Thunderbird, Firefox and Firefox-ESR. Users are compelled to upgrade to the latest versions  immediately in order to keep their systems safe from attackers. These vulnerabilities affect all three platforms- Windows, Linux and Mac for which separate patches have been released by the vendor.

CVE Assigned:-

CVE-2020-15999
CVE-2020-26951
CVE-2020-26952
CVE-2020-16012
CVE-2020-26953
CVE-2020-26954
CVE-2020-26955
CVE-2020-26956
CVE-2020-26957
CVE-2020-26958
CVE-2020-26959
CVE-2020-26960
CVE-2020-26961
CVE-2020-26962
CVE-2020-26963
CVE-2020-26964
CVE-2020-26965
CVE-2020-26966
CVE-2020-26967
CVE-2020-26968
CVE-2020-26969

Affected software:
Mozilla Firefox before 83.0
Mozilla Firefox ESR before 78.5
Mozilla Thunderbird before 78.5
Solution:
To address this vulnerability, the vendor has released security patches. For more information, please refer to our blog
Use the SanerNow platform to apply this critical patch quickly across the organization as shown below.

SanerNow: Vulnerability detection and patching of Mozilla Firefox, ESR and Thunderbird
1. Login to SanerNow platform
2. Switch to the account/site specific view and Go to 'VM tool'
3. If your Application (Firefox or Firefox ESR) is vulnerable, Saner lists the above CVEs in 'Top Vulnerabilities or 'Recently Discovered Vulnerabilities' as shown in the below diagram

4. Search for this vulnerability in the VM tool. If you are affected, apply the patch through PM -> Missing Patches
5. Select 'Groups/Devices' in the 'Asset Source' section and click 'Apply'.
6. Select the product 'Mozilla Firefox' or 'Mozilla Firefox ESR' or 'Thunderbird' from the 'Asset' section as shown in the below image:.

7. Select 'Apply Selected Patches' at the rightmost corner. This will prompt for 'Creating Patching Task'. Fill in 'Task Name' and 'Remediation Schedule' as per your preference and click on 'Apply Selected Patches' as shown below,

8. Remediation job will be created, which will fix the vulnerability by upgrading Mozilla Firefox or Firefox ESR or Thunderbird to the latest patch version.
9. Once remediation is done, the Saner agent automatically scans again and upload the result to SanerNow as shown below,