Window Merger

Merge specified browser windows into each other. Or all of them into one. Simply right click to open Firefox’s context menu when multiple windows are open, or configure a keyboard shortcut. All wrapped up in one tiny free extension.

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manifest.json

{
  "name": "Window Merger",
  "version": "0.6.0",
  "description": "Options to merge browser windows into one",
  "icons": {
    "16": "assets/icon016.png",
    "24": "assets/icon024.png",
    "32": "assets/icon032.png"
  },
  "developer": {
    "name": "Martijn van der Ven",
    "url": "https://vanderven.se/martijn/"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "merge-all-windows": {
      "description": "Merge all windows into the current one."
    },
    "merge-previous-window": {
      "description": "Merge previously focused window into the current one."
    }
  },
  "manifest_version": 2,
  "options_ui": {
    "page": "preferences.html"
  },
  "permissions": [
    "tabs",
    "menus",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "56.0"
    }
  }
}