Intent to ship: WebAssembly multi-memory

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Ben Visness

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Feb 27, 2024, 5:00:52 PMFeb 27
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We intend to enable WebAssembly multi-memory by default in Firefox 125.

Summary: Wasm multi-memory allows wasm modules to use and import multiple independent linear memories. This enables more efficient interop between modules, and better polyfills for upcoming wasm standards like the component model.

Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1782585
Bug to turn on by default: https://bugzilla.mozilla.org/show_bug.cgi?id=1860816

Specification: https://github.com/WebAssembly/multi-memory/blob/main/proposals/multi-memory/Overview.md
Standards Body: WebAssembly Community Group
Platform coverage: All platforms
Preference: javascript.options.wasm_multi_memory
Other browsers:
    Blink: Shipped since version 120.
    WebKit: No public signals on shipping.

web-platform-tests:
None. We test this with our own JS tests and the official WebAssembly specification tests for the feature.
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