Multiple serious vulnerabilities have been found in Mozilla products. Malicious users can exploit these vulnerabilities to bypass security restrictions, cause denial of service, execute arbitrary code or obtain sensitive information.

Below is a complete list of vulnerabilities

1. Multiple memory bugs can be exploited remotely via vectors related to browser engine;
2. Error while fixing previous vulnerabilities can be exploited remotely via specially designed URL;
3. Improper IDBDatabase handling can be exploited remotely via an unknown vectors;
4. Out-of-bound read can be exploited via vectors related to web audio, specially designed XMLHttpRequest object and DOM objects manipulations;
5. Uninitialized memory usage can be exploited remotely via an unknown vectors;
6. Lack of certificates override restrictions can be exploited remotely via making user to override certificate;
7. Recording keystrokes that triggered errors can be exploited remotely via crash reports from OS X;
8. An unknown vulnerability in PDF.js can be exploited remotely via a specially designed PDF;
9. Multiple TLS vulnerabilities can be exploited remotely via an unknown vectors.

Mozilla Firefox versions earlier than 39
Mozilla Firefox ESR versions earlier than 31.8
Mozilla Firefox ESR versions earlier than 38.1
Mozilla Thunderbird versions earlier than 38.1

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Mozilla Foundation security Advisories