tab groups for tree style tabs

This addon group tabs. Ctrl-Shift-Right(Left) to switch to next(Previous) group. Use with tree style tabs(https://addons.mozilla.org/en-US/firefox/addon/tree-style-tab/)

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manifest.json

{
  "manifest_version": 2,
  "name": "tab groups for tree style tabs",
  "version": "1.5.2resigned1",
  "permissions": [
    "activeTab",
    "menus",
    "contextMenus",
    "contextualIdentities",
    "sessions",
    "storage",
    "tabs"
  ],
  "background": {
    "scripts": [
      "./background/background.js"
    ]
  },
  "commands": {
    "switch-to-next-group": {
      "suggested_key": {
        "default": "Ctrl+Shift+Right"
      }
    },
    "switch-to-previus-group": {
      "suggested_key": {
        "default": "Ctrl+Shift+Left"
      }
    }
  },
  "browser_action": {
    "default_title": "Tab Group",
    "default_popup": "./popup/popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7814a2d1-81c3-4036-b64a-2ba9e62f707d}"
    }
  }
}