Don't "Accept" image/webp

This extension removes image/webp and/or image/avif from the list of formats Firefox tells sites that it accepts. That discourages many servers from replacing JPEG and PNG images with WebP/AVIF. (But some may send them anyway; they aren't blocked.)

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manifest.json

{
  "name": "Don't Accept image/webp",
  "description": "Strip image/webp from Accept: headers, which should discourage servers from replacing JPEG and PNG images with WebP images.",
  "version": "0.9",
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "[email protected]",
      "strict_min_version": "60.0"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "<all_urls>",
    "activeTab",
    "webRequest",
    "webRequestBlocking",
    "storage",
    "management"
  ],
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "128": "icons/do-accept-webp2.png"
    },
    "default_title": "Don't Accept WebP",
    "default_popup": "popup.html"
  }
}