[CRX] Enable WebAssembly in Chrome extension

After the removal of 'unsafe-eval' CSP in mozilla#18651, WebAssembly fails to
load, resulting in issues such as seen in mozilla#18457.

Manifest Version 3 does not allow 'unsafe-eval', does accept the more
specific 'wasm-unsafe-eval' as of Chrome 103. Note that manifest.json
already sets minimum_chrome_version to 103.

This patch also adds `object-src 'self'` because it was required until
Chrome 110. As of Chrome 111, the default is `object-src 'self'` and
`object-src` is no longer required. We could drop `object-src` in the
future, but for now we need to include it to support Chrome 103 - 110.

extensions/chromium/manifest.json

@@ -27,6 +27,9 @@
       "js": ["contentscript.js"]
     }
   ],
+  "content_security_policy": {
+    "extension_pages": "script-src 'self' 'wasm-unsafe-eval'; object-src 'self'"
+  },
   "storage": {
     "managed_schema": "preferences_schema.json"
   },