Go over security slider governed preferences and update them where needed
While reviewing the patch for #26128 (moved) i realized there are new preferences we might to add (javascript.options.wasm_baselinejit and javascript.options.wasm_ionjit come to mind) and there might be old ones we could remove. We should double-check that during the ESR60 stabilization.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information