firefox

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Firefox Local Mode for Web Developers
2 months ago
- Local Mode allows loading local files via custom https:// URLs in Firefox.
- It eliminates the need to run a local HTTP server for testing web pages.
- It enables testing Web APIs, including those restricted to Secure Contexts.
- Each mapping provides a distinct origin (domain) for dedicated storage/cookies per project.
- Mappings are only accessible from Firefox and are not exposed to other programs or malicious software.
- Mappings are only functional when DevTools are opened.
- The feature is available starting in Firefox 153 and is configured in the DevTools Options panel.
- Each mapping defines an origin (custom https URL) and a local folder path.
- Loading a file:// URL with DevTools open shows a notification with actions to add the mapping to settings or try a transient mapping.
- Mappings can also be managed via about:config using three preferences per mapping: origin, path, and disabled.
Related UI elements should not appear unrelated
2 months ago
- UI design trend where related elements appear increasingly detached from each other, e.g., tabs floating separately from content windows.
- Historical comparison: Chrome 2010 and Firefox 2015 had clear connections between tabs and content, while modern Firefox (v.148 and Nova) shows extreme separation with floating bubbles.
- Criticism: This design loses space and creates false separation, contradicting the natural connection between tabs and their content windows.
- Suggestion: Active tab should be connected to its content window, with inactive tabs as floating bubbles, for better usability.
Open Link in Unloaded Tab, a little Firefox extension
2 months ago
- Published a new Firefox extension called 'Open Link in Unloaded Tab'.
- Adds a right-click context menu option to open links in unloaded tabs, saving system resources.
- Previously, Firefox had no way to open a new tab in the unloaded state.
- The extension is simple, with a custom icon that cost about $15.
- This is the developer's first extension submitted to the Firefox Add-ons directory.
Firefox in WebAssembly
2 months ago
- Firefox has been compiled to WebAssembly using Puter, allowing it to run inside another browser like Chrome.
- The project chose Firefox/Gecko for its strong single-process support.
- An estimated $25,000 worth of Claude Opus and Fable tokens were used, but a Max subscription reduced the actual cost.
- All network traffic is proxied through Puter's server via the WebSocket-based Wisp protocol to bypass browser network restrictions.
- The setup supports end-to-end encryption, verified by inspecting WebSocket messages.
- The code is available in the firefox-wasm repository, and a similar WebKit project exists but lacks a demo.
Mohabi: Disaggregating and Sandboxing the Firefox JavaScript Engine
2 months ago
- Mohabi is a modern Firefox browser with a securely sandboxed JavaScript engine (SpiderMonkey) using software-based fault isolation (SFI).
- The JavaScript engine was disaggregated from the rest of the browser, requiring complex transformation across data structures and control flow.
- An optimized SFI toolchain was developed to handle large memory footprints and unique JavaScript engine challenges.
- Mohabi incurs modest overheads: 24.82% on JetStream and 24.43% on Speedometer benchmarks.
- The x86-64 SFI toolchain is the fastest to date, with overheads between 5.9%–6.6% on SPEC 2017.
- This is the most ambitious case study of retrofitting in-process sandboxing in a large system.
Firefox Containers Preview
2 months ago
- Firefox 153 introduces a native Containers Preview feature for managing separate online identities (work, shopping, personal, banking) in one browser window.
- Containers isolate cookies and ad tracking to prevent cross-container activity, stopping targeted ads from interfering across contexts.
- The feature builds on the popular Multi-Account Containers extension, integrating it directly into Firefox for easier access and support.
- Key benefits include default visibility, simplified workflow, preserved core functionality, and ongoing investment in the feature.
- In the preview, users can open tabs in specific containers, customize containers with names/colors/icons, and manage settings via Firefox Settings.
- Existing extension users can keep using the add-on alongside the native feature, as not all add-on features are yet replicated.
- Mozilla invites user feedback on the Containers Preview through Mozilla Connect to shape future development.
Firefox 153.0 Beta
2 months ago
- Firefox Beta and Developer Edition release notes provide information on new features.
- Users can submit feedback, file bugs in Bugzilla, or check system requirements.
- Multiple download options are available, including for Linux 64-bit and ARM64 systems.
- The release notes emphasize that users' systems might not meet requirements, offering alternative versions.
Firefox new Wrexham shirt sponsor
2 months ago
- Wrexham signs Firefox as main shirt sponsor for 2026-27 season, replacing United Airlines.
- Deal aligns with club's underdog story and global exposure from Hollywood owners and documentary.
- Sponsorship income has grown significantly, accounting for over half of £33.35 million revenue in 2024-25.
- Club's popularity drives high shirt sales, with orders expected to exceed 100,000 for new season.
- New sponsorship crucial under Championship financial rules, compensating for limited matchday revenue.

firefox

Firefox Local Mode for Web Developers

Related UI elements should not appear unrelated

Open Link in Unloaded Tab, a little Firefox extension

Firefox in WebAssembly

Mohabi: Disaggregating and Sandboxing the Firefox JavaScript Engine

Firefox Containers Preview

Firefox 153.0 Beta

Firefox new Wrexham shirt sponsor