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  • Caniuse and MDN compatibility data collaboration

    Today we’re announcing the integration of MDN’s compat data into the caniuse website. Together, we’re bringing even more web compatibility information into the hands of web developers. The post Caniuse and MDN compatibility data collaboration appeared first on Mozilla Hacks - the Web developer blog.

  • Debugging TypeScript in Firefox DevTools

    Firefox Debugger has evolved into a fast and reliable tool chain over the past several months and it’s now supporting many cool features. Though it's primarily used to debug JavaScript, did you know that you can also use Firefox to debug your TypeScript applications? Jan 'Honza' Odvarko walks through some ...

  • Debugging WebAssembly Outside of the Browser

    WebAssembly has begun to establish itself outside of the browser via dedicated runtimes like Mozilla’s Wasmtime and Fastly’s Lucet. While the promise of a new, universal format for programs is appealing, it also comes with new challenges. At Mozilla, we’ve been prototyping ways to enable source-level debugging of .wasm files ...

  • Firefox 69 — a tale of Resize Observer, microtasks, CSS, and DevTools

    For our latest excellent adventure, we’ve gone and cooked up a new Firefox release. Version 69 features a number of great new additions including JavaScript public instance fields, the Resize Observer and Microtask APIs, CSS logical overflow properties (e.g. overflow-block) and @supports for selectors. The post Firefox 69 — a ...

  • The Baseline Interpreter: a faster JS interpreter in Firefox 70

    Modern web applications load and execute a lot more JavaScript code than they did just a few years ago. While JIT (just-in-time) compilers have been very successful in making JavaScript performant, we needed a better solution. We’ve added a new, generated JavaScript bytecode interpreter to the JavaScript engine in Firefox ...

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