Hebrew support for Slack. RTL Firefox

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manifest.json
{
  "manifest_version": 2,
  "name": "__MSG_extensionName__",
  "description": "__MSG_extensionDescription__",
  "default_locale": "en",
  "version": "1.8",
  "browser_specific_settings": {
    "gecko": {
      "id": "slack-rtl@benderbureau.com"
    }
  },
  "permissions": [
    "storage",
    "tabs"
  ],
  "content_security_policy": "default-src 'self' 'unsafe-inline' https://fonts.gstatic.com https://slack-rtl-activation.vercel.app; font-src 'self' https://fonts.gstatic.com fonts.gstatic.com data:; style-src 'self' 'unsafe-inline'; script-src 'self' 'unsafe-inline';",
  "browser_action": {
    "default_icon": "icon16.png",
    "default_popup": "default_popup.html"
  },
  "options_ui": {
    "page": "default_popup.html",
    "open_in_tab": false
  },
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.slack.com/*"
      ],
      "js": [
        "jquery.min.js",
        "slack-rtl.js"
      ],
      "css": [
        "slack-rtl.css"
      ]
    }
  ]
}

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