Firefox Multi-Account Containers: Advanced Ways to Isolate Your Browsing

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Firefox Multi-Account Containers separate websites into isolated containers, each with its own cookies, storage, and cache, so sites cannot read each other's data. Users can keep work and personal accounts logged in at the same time, or confine social media and Amazon to dedicated containers to limit cross-site tracking. Assigning a domain to a container via right-click makes Firefox open it there automatically, and the Temporary Containers extension adds disposable containers for untrusted browsing. Developers can use containers to test cookie isolation and logged-out states without incognito windows. The article also notes that all containers share the same IP address, so they do not hide network identity from sites.

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Open Diagnostics: A Hacktoberfest Open-Source AI Challenge Submission

A DEV Community post presents a submission to the Hacktoberfest Open-Source AI Challenge, Week 2, themed "Side Hustle." The author links to a GitHub repository hosting the project. The post itself offers little beyond the submission notice and the repository reference. No details about the project's features, functionality, or outcomes are included in the text provided.

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ProgrammingDEV Community ·

Scaling Node.js and PostgreSQL APIs: Pooling, Validation, Indexing and Queues

Backend slowdowns under heavy traffic often stem from inefficient database queries, missing connection pooling, and weak async handling rather than hardware limits. The article recommends using a managed connection pool through pg or Prisma instead of opening a new client per request. It also advises validating incoming data at the API edge with Zod or class-validator before it reaches the database. Indexing with B-tree or GIN structures is highlighted as a way to speed up slow queries on large PostgreSQL tables. Finally, offloading heavy tasks such as webhooks and third-party calls to background queue workers is presented as key to predictable performance.

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ProgrammingDEV Community ·

Firefox Print and Save-to-PDF Features Many Users Overlook

Firefox's recent print interface, introduced around version 87, includes a live preview sidebar that updates as settings change. Users can save pages directly to PDF without an external printer, with clickable links and searchable text preserved. Reader View can produce cleaner printouts of article pages by stripping navigation, ads, and sidebars. Additional options cover page layout, headers and footers, paper sizes, and selection-only printing. Developers can also test print stylesheets through DevTools by emulating print media.

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ProgrammingDEV Community ·

Amir Ali's MatchReady and Smart Doc Show Two Hard Frontend Problems Solved

Developer Amir Ali, a full-stack engineer in Karachi, Pakistan, has released two open-source side projects that tackle deceptively difficult frontend challenges. MatchReady is a browser-based 2D soccer drill builder that animates player movement and exports drills as GIFs, with no backend or account required. Its playback logic is designed as a pure function of time, so the live preview and the exported GIF match frame for frame. The project also samples curved paths and reparameterises them by arc length so that movement speed stays consistent along curves. Smart Doc is a small collaborative editor supporting shared documents, role-based permissions, comments, version history and Markdown or PDF export. Both projects are open source and include live demos for anyone who wants to examine the code.

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