Text Blackness

Darken grey/colourful text on web pages. No more squinting at grey fonts for those of us with bad eyesight.
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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "Text Blackness",
  "version": "1.5",
  "description": "Darken grey/colourful text on web pages. No more squinting at grey fonts for those of us with bad eyesight.",
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "64": "images/icon64.png",
    "128": "images/icon128.png",
    "256": "images/icon256.png"
  },
  "permissions": [
    "storage"
  ],
  "content_scripts": [
    {
      "js": [
        "content.js"
      ],
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "run_at": "document_idle"
    }
  ],
  "background": {
    "service_worker": "background.js"
  },
  "action": {
    "default_icons": {
      "48": "images/icon.png"
    },
    "default_title": "Text Blackness",
    "default_popup": "pop.html"
  }
}