Examine source code of Image Video Block

{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "version": "3.5resigned1",
  "description": "__MSG_extensionDescription__",
  "homepage_url": "https://github.com/tiborbarsi/image-video-block-browser-addon",
  "icons": {
    "32": "icons/32_black.png"
  },
  "permissions": [
    "storage",
    "<all_urls>",
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "menus"
  ],
  "browser_action": {
    "default_title": "__MSG_extensionName__",
    "default_icon": "icons/32_black.png",
    "default_popup": "popup/popup.html",
    "theme_icons": [
      {
        "light": "icons/32_white.png",
        "dark": "icons/32_black.png",
        "size": 32
      }
    ]
  },
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content_scripts/content_script.js"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "options_ui": {
    "page": "options/options.html"
  },
  "commands": {
    "imgBlock": {
      "suggested_key": {
        "default": "Ctrl+Shift+1"
      },
      "description": "Toggle the image block option"
    },
    "mediaBlock": {
      "suggested_key": {
        "default": "Ctrl+Shift+2"
      },
      "description": "Toggle the media block option"
    },
    "videoHide": {
      "suggested_key": {
        "default": "Ctrl+Shift+3"
      },
      "description": "Toggle the video hide option"
    },
    "flashHide": {
      "suggested_key": {
        "default": "Ctrl+Shift+4"
      },
      "description": "Toggle the flash hide option"
    },
    "canvasHide": {
      "suggested_key": {
        "default": "Ctrl+Shift+5"
      },
      "description": "Toggle the canvas hide option"
    },
    "svgHide": {
      "suggested_key": {
        "default": "Ctrl+Shift+6"
      },
      "description": "Toggle the svg hide option"
    }
  },
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "{dabe08f4-8ec2-4dc5-a4dd-fda31fb8b38c}"
    }
  }
}