View content instead of saving Firefox

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manifest.json
{
  "name": "View content instead of saving",
  "description": "With this extension images, videos and PDF files will always be opened for viewing instead of saving.",
  "version": "5.1.1",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "<all_urls>",
    "activeTab",
    "webRequest",
    "webRequestBlocking",
    "storage"
  ],
  "browser_action": {
    "browser_style": true,
    "default_icon": {
      "128": "icons/image.png"
    },
    "default_title": "View content instead of saving",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cdf1f90e-b73a-4c6b-a49a-ddabef33798f}"
    }
  }
}

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