Organization behind the Firefox browser and Gecko engine, also maintaining open web documentation such as MDN.
Google Chrome, Microsoft Edge, Mozilla Firefox and MDN have jointly released Modern Web Guidance, a skill set that embeds web platform best practices and browser compatibility data directly into coding agents to steer them away from legacy JavaScript patterns. It ships with an npx install wizard and a legacy-scan detector trained on 30k GitHub repos to flag outdated patterns for modernization.
Datasette author Simon Willison found that Firefox automatically prefetches the next page of rows based on the link rel=next HTTP header, causing wasted rendering and bandwidth for the vast majority of visitors who never click through. He changed Datasette to stop sending that header to Firefox for HTML pages. The underlying Mozilla bug has been open for 24 years, and his own 2002 blog post on the behavior had been entirely forgotten.