Mozilla develops Firefox and related internet technologies, with vulnerability disclosures and security updates relevant to browser security and safety.
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Background for this topic.
Mozilla is an open-source software organization best known for developing Firefox and related internet technologies. Its security relevance centers on software that parses untrusted web content: browsers expose users to malicious sites, crafted documents, extensions, and vulnerable dependencies, so flaws in rendering, JavaScript, networking, or privilege boundaries can have serious consequences.
Mozilla publishes security advisories for Firefox and maintains release channels including Extended Support Release (ESR), providing data for vulnerability and patch management. High-severity bugs may enable code execution, sandbox escape, credential theft, or privacy exposure, although severity alone does not prove exploitation. Practitioners should track advisories and affected versions, prioritize updates, restrict untrusted extensions, and apply enterprise policies where appropriate. Firefox privacy controls, including tracking protection and anti-fingerprinting features, reduce some collection and profiling but do not replace endpoint hardening or secure identity practices.
Weekly headline count for the current query.
Mozilla released Firefox 149 with added privacy protection through a built-in VPN tool offering up to 50GB of monthly traffic. [...]
In response to user feedback on AI integration, Mozilla announced today that the next Firefox release will let users disable AI features entirely or manage them individually. [...]
Mozilla announced a major privacy upgrade in Firefox 145 that reduces even more the number of users vulnerable to digital fingerprinting. [...]
Starting next month, Mozilla will require Firefox extension developers to disclose whether their add-ons collect or share user data with third parties. [...]
Mozilla has announced a new feature that enables Firefox extension developers to roll back to previously approved versions, allowing them to quickly address critical bugs and issues. [...]
A recent ruling from Germany's Federal Supreme Court (BGH) has revived a legal battle over whether browser-based ad blockers infringe copyright, raising fears about a potential ban of the tools in the country. [...]
A malicious campaign dubbed 'GreedyBear' has snuck onto the Mozilla add-ons store, targeting Firefox users with 150 malicious extensions and stealing an estimated $1,000,000 from unsuspecting victims. [...]
Mozilla has warned browser extension developers of an active phishing campaign targeting accounts on its official AMO (addons.mozilla.org) repository. [...]
Mozilla has developed a new security feature for its add-on portal that helps block Firefox malicious extensions that drain cryptocurrency wallets. [...]
Mozilla has rolled out an emergency Firefox 139.0.1 update after the Tuesday release caused graphical artifacts on PCs with NVIDIA GPUs. [...]
Mozilla released emergency security updates to address two Firefox zero-day vulnerabilities demonstrated in the recent Pwn2Own Berlin 2025 hacking competition. [...]
During the second day of Pwn2Own Berlin 2025, competitors earned $435,000 after exploiting zero-day bugs in multiple products, including Microsoft SharePoint, VMware ESXi, Oracle VirtualBox, Red Hat Enterprise Linux, and Mozilla Firefox. [...]
Mozilla has released Firefox 136.0.4 to patch a critical security vulnerability that can let attackers escape the web browser's sandbox on Windows systems. [...]
Mozilla is warning Firefox users to update their browsers to the latest version to avoid facing disruption and security risks caused by the upcoming expiration of one of the company's root certificates. [...]
Mozilla has renewed its promise to continue supporting Manifest V2 extensions alongside Manifest V3, giving users the freedom to use the extensions they want in their browser. [...]
In an effort to turn the tide, Mozilla is testing a fresh approach that could persuade more people to switch their default browser on Windows during the installation of the browser. [...]
Mozilla is testing a fresh approach that could persuade more people to switch their default browser on Windows. [...]
Mozilla has issued an emergency security update for the Firefox browser to address a critical use-after-free vulnerability that is currently exploited in attacks. [...]
European digital rights group NOYB (None Of Your Business) has filed a privacy complaint with the Austrian data protection watchdog (DSB) against Mozilla, alleging the company uses a Firefox privacy feature (enabled without consent) to track users' online behavior. [...]
A vulnerability disclosed 18 years ago, dubbed "0.0.0.0 Day", allows malicious websites to bypass security in Google Chrome, Mozilla Firefox, and Apple Safari and interact with services on a local network. [...]