manifest.json

{
  "name": "Markdown Preview",
  "version": "0.7",
  "description": "Converts and previews Markdown files to HTML right inside Chrome.",
  "icons": {
    "128": "images/icon.png",
    "48": "images/icon.png",
    "16": "images/icon.png"
  },
    "options_ui": {
    "page": "options.html",
    "chrome_style": true
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*.md*"      , "*://*/*.md",
        "*://*/*.mdown*"   , "*://*/*.mdown",
        "*://*/*.markdown*", "*://*/*.markdown",
        "*://*/*.markdn*"  , "*://*/*.markdn",
        "*://*/*.mdtext*"  , "*://*/*.mdtext",
        "*://*/*.mdtxt*"   , "*://*/*.mdtxt",
        "*://*/*.mdwn*"    , "*://*/*.mdwn",
        "*://*/*.mkd*"     , "*://*/*.mkd",
        "*://*/*.mkdn*"    , "*://*/*.mkdn",
        "*://*/*.text*"    , "*://*/*.text",
        "file:///*.md*"      , "file:///*.md",
        "file:///*.mdown*"   , "file:///*.mdown",
        "file:///*.markdown*", "file:///*.markdown",
        "file:///*.markdn*"  , "file:///*.markdn",
        "file:///*.mdtext*"  , "file:///*.mdtext",
        "file:///*.mdtxt*"   , "file:///*.mdtxt",
        "file:///*.mdwn*"    , "file:///*.mdwn",
        "file:///*.mkd*"     , "file:///*.mkd",
        "file:///*.mkdn*"    , "file:///*.mkdn",
        "file:///*.text*"    , "file:///*.text"
      ],
      "js": ["showdown.js", "markdownify.js"]
    }
  ],
  "permissions": ["tabs", "<all_urls>", "storage"],
  "manifest_version": 2,
  "web_accessible_resources": [
    "themes/originalTheme.css",
    "themes/cleanTheme.css"
  ]
}