Examine source code of FitnetEnhancer

{
  "manifest_version": 2,
  "name": "FitnetEnhancer",
  "version": "0.2",
  "description": "Display complete labels and enlarge width of table on PageactivitesByCollaborateurCrossData (Be lenient, it's hardcoded sizes)",
  "icons": {
    "48": "icons/raccoon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.fitnetmanager.com/FitnetManager/PageactivitesByCollaborateurCrossData.xhtml?*"
      ],
      "js": [
        "stopMadness.js"
      ]
    }
  ]
}