VERSION: OS: Ubuntu 20.04.1 LTS OS type: 64-bit Firefox: 83.0 (64-bit) Mozilla Firefox for Ubuntu canonical -1.0 ISSUE: All of the WebAssembly / Wasm error messages I receive in the FF console give a generic response instead of specific messages (like previous versions offered). I recorded some of the previous error messages in content I was creating for others which explained how to resolve those error messages. This is an example of what I used to see in the console. BEFORE: ------------------- Firefox 70.0.1 CompileError: wasm validation error: at offset 824: popping value from empty stack Firefox 80 Uncaught (in promise) CompileError: wasm validation error: at offset 47: initializer expression must reference a global immutable import Firefox 80 Uncaught (in promise) LinkError: imported Memory with incompatible size ------------------- Now, when I do the same things that would trigger those errors, the message I get is vague and not specific at all. AFTER: ------------------- Firefox 83 Uncaught (in promise) Error: undefined ------------------- This makes it much more difficult to debug my Wasm in the browser and halts me from sharing my findings with others. I did look in the about:config settings (in case they added a flag) and tried switching javascript.options.wasm.verbose from ‘false’ to ‘true’ but that was not a solution. Setting that flag to true only gave more references to the phases of the compilations but did not give me back the error reporting I used to see for Wasm. I need to know how to enable the actual error messages again for Wasm or understand why the helpful messages were changed into a generic message. I’m hoping that it just an accident they are not displaying.