Examine source code of Paid Content Alert

{
  "manifest_version": 2,
  "name": "__MSG_extName__",
  "version": "0.3.78",
  "description": "__MSG_extDesc__",
  "default_locale": "en",
  "author": "Jan Richter",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "content_scripts": [
    {
      "js": [
        "content.js"
      ],
      "matches": [
        "*://*.digizone.cz/*",
        "*://*.wsj.com/articles/*",
        "*://*.thetimes.co.uk/*",
        "*://*.welt.de/*",
        "*://*.reportermagazin.cz/a/*",
        "*://*.bild.de/bild-plus/*",
        "*://*.dtest.cz/*",
        "*://*.psychologie.cz/*",
        "*://*.montyrich.cz/*",
        "*://*.echo24.cz/a/*",
        "*://*.067.cz/archiv/*",
        "*://*.telegraph.co.uk/*",
        "*://*.investors.com/*",
        "*://*.e15.cz/*",
        "*://*.irishtimes.com/*",
        "*://*.valor.com.br/*",
        "*://*.kyivpost.com/*",
        "*://*.haaretz.com/*",
        "*://*.theaustralian.com.au/*",
        "*://*.lefigaro.fr/*",
        "*://*.folha.uol.com.br/*",
        "*://*.ekonom.ihned.cz/*",
        "*://*.archiv.ihned.cz/*",
        "*://*.lexpress.fr/*",
        "*://*.mediapart.fr/*",
        "*://*.pressandjournal.co.uk/*",
        "*://*.polityka.pl/*",
        "*://*.newsweek.pl/*",
        "*://*.gazetapolska.pl/*",
        "*://*.gloswielkopolski.pl/*",
        "*://*.kurierlubelski.pl/*",
        "*://*.dziennikzachodni.pl/*",
        "*://*.dzienniklodzki.pl/*",
        "*://*.dziennikbaltycki.pl/*",
        "*://*.gs24.pl/*",
        "*://*.pomorska.pl/*",
        "*://*.gazetalubuska.pl/*",
        "*://*.expressilustrowany.pl/*",
        "*://*.plus.echodnia.eu/*",
        "*://*.pb.pl/*",
        "*://*.gazetaprawna.pl/*",
        "*://*.wyborcza.pl/*",
        "*://*.espresso.repubblica.it/*",
        "*://*.zeit.de/*",
        "*://*.spiegel.de/*",
        "*://*.thueringer-allgemeine.de/*",
        "*://*.haz.de/*",
        "*://*.freiepresse.de/*",
        "*://*.handelsblatt.com/*",
        "*://*.sueddeutsche.de/*",
        "*://*.plus.faz.net/*",
        "*://*.lepoint.fr/*",
        "*://*.nouvelobs.com/*",
        "*://*.sudouest.fr/*",
        "*://*.ouest-france.fr/*",
        "*://*.letelegramme.fr/*",
        "*://*.ledauphine.com/*",
        "*://*.lavoixdunord.fr/*",
        "*://*.dna.fr/*",
        "*://*.lesechos.fr/*",
        "*://*.lemonde.fr/*",
        "*://*.humanite.fr/*",
        "*://*.ts.fi/*",
        "*://*.savonsanomat.fi/*",
        "*://*.karjalainen.fi/*",
        "*://*.ilkka.fi/*",
        "*://*.hbl.fi/*",
        "*://*.ess.fi/*",
        "*://*.summa.talentum.fi/*",
        "*://*.plus.iltalehti.fi/*",
        "*://*.is.fi/*",
        "*://*.hs.fi/*",
        "*://*.fvn.no/*",
        "*://*.krsby.no/*",
        "*://*.aftenposten.no/*",
        "*://*.dagbladet.no/*",
        "*://*.pluss.vg.no/*",
        "*://*.bt.no/*",
        "*://*.foreignaffairs.com/*",
        "*://*.content.time.com/*",
        "*://*.barrons.com/*",
        "*://*.politiken.dk/*",
        "*://*.information.dk/*",
        "*://*.kristeligt-dagblad.dk/*",
        "*://*.jyllands-posten.dk/*",
        "*://*.mediawatch.dk/*",
        "*://*.energiwatch.dk/*",
        "*://*.fodevarewatch.dk/*",
        "*://*.medwatch.dk/*",
        "*://*.finanswatch.dk/*",
        "*://*.ejendomswatch.dk/*",
        "*://*.shippingwatch.dk/*",
        "*://*.finans.dk/*",
        "*://*.business.dk/*",
        "*://*.berlingske.dk/*",
        "*://*.idnes.cz/*",
        "*://*.denikn.cz/*",
        "*://*.dennikn.sk/*",
        "*://*.lvz.de/*",
        "*://*.denik.cz/*",
        "*://*.independent.ie/*",
        "*://*.zive.cz/*",
        "*://*.firstclass.cz/*",
        "*://*.refresher.cz/*",
        "*://*.ekonom.cz/*"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "sites.json",
    "Loader.js"
  ]
}