{

  "description": "Adds a View Page Source button to the toolbar",
  "manifest_version": 2,
  "name": "View Page Source Button",
  "version": "2.0.1",

  "permissions": [
      "storage",
      "tabs",
      "<all_urls>"
],

  "background": {
    "scripts": ["main.js"]
  },

  "browser_action": {
    "default_icon": {
      "16": "icons/view-page-source-16.png",
      "32": "icons/view-page-source-32.png",
      "64": "icons/view-page-source-64.png"
    }
  },

  "icons": {
    "32": "icons/view-page-source-32.png",
    "64": "icons/view-page-source-64.png"
  },

  "options_ui": {
    "page": "options/options.html"
  },

  "applications": {
    "gecko": {
      "id": "@mpopp-view-page-source",
      "strict_min_version": "60.0"
    }
  }
}

{

  "description": "Adds a View Page Source button to the toolbar",
  "manifest_version": 2,
  "name": "View Page Source Button",
  "version": "2.0.2",

  "permissions": [
      "storage",
      "tabs",
      "<all_urls>"
],

  "background": {
    "scripts": ["main.js"]
  },

  "browser_action": {
    "default_icon": {
      "16": "icons/view-page-source-16.png",
      "32": "icons/view-page-source-32.png",
      "64": "icons/view-page-source-64.png"
    }
  },

  "icons": {
    "32": "icons/view-page-source-32.png",
    "64": "icons/view-page-source-64.png"
  },

  "options_ui": {
    "page": "options/options.html"
  },

  "applications": {
    "gecko": {
      "id": "@mpopp-view-page-source",
      "strict_min_version": "68.0"
    }
  }
}

Set min. version to 68.0, version 2.0.2
Set min. version to 68.0, version 2.0.2
