Mozilla disables asm.js optimizations in Firefox 148, recommends WebAssembly migration
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eqrion
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Summary
Mozilla is disabling asm.js optimizations in Firefox 148's SpiderMonkey engine by default, with plans to fully remove the code in a future release. The article explains that asm.js was Mozilla's historical response to performance needs in JavaScript, but WebAssembly has since become the standard for high-performance web applications. Existing asm.js code will continue to work through regular JIT compilation, but the article recommends recompiling to WebAssembly for better performance and smaller binary sizes.
Key quotes
· 4 pulledAs of Firefox 148, SpiderMonkey's asm.js optimizations are disabled by default, and we plan to remove the code entirely in a future release.
If you maintain a site that uses asm.js, nothing will break. asm.js is just a subset of plain JavaScript, so the code keeps running through our regular JIT just like any other script.
That said, recompiling to WebAssembly will get you faster execution and smaller binaries.
asm.js was Mozilla's response to the qu
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