Update extension version & strict minimum version

JSON also standardized (sorted keys and 2 spaces indent)

manifest.json

@@ -1,38 +1,33 @@
 {
-    "manifest_version": 2,
-    "version": "1.3",
-    "name": "Dark Theme Chroma",
-    "short_name": "Dark Chroma",
-    "description": "Clean dark theme with chroma RGB lighting",
-
-    "developer":
-    {
-        "name": "VoidTwo",
-        "url": "https://github.com/VoidTwo/Dark-Theme-Chroma-Firefox"
-    },
-
-    "icons":
-    {
-        "16": "icons/icon_16x16.png",
-        "32": "icons/icon_32x32.png",
-        "48": "icons/icon_48x48.png",
-        "64": "icons/icon_64x64.png",
-        "96": "icons/icon_96x96.png",
-        "128": "icons/icon_128x128.png"
-    },
-
-    "browser_specific_settings":
-    {
-        "gecko":
-        {
-            "strict_min_version": "89.0a1"
-        }
-    },
-
-    "permissions": ["alarms", "theme"],
-
-    "background":
-    {
-        "scripts": ["background.js"]
+  "background": {
+    "scripts": [
+      "background.js"
+    ]
+  },
+  "browser_specific_settings": {
+    "gecko": {
+      "strict_min_version": "100.0"
     }
+  },
+  "description": "Clean dark theme with chroma RGB lighting",
+  "developer": {
+    "name": "VoidTwo",
+    "url": "https://github.com/VoidTwo/Dark-Theme-Chroma-Firefox"
+  },
+  "icons": {
+    "128": "icons/icon_128x128.png",
+    "16": "icons/icon_16x16.png",
+    "32": "icons/icon_32x32.png",
+    "48": "icons/icon_48x48.png",
+    "64": "icons/icon_64x64.png",
+    "96": "icons/icon_96x96.png"
+  },
+  "manifest_version": 2,
+  "name": "Dark Theme Chroma",
+  "permissions": [
+    "alarms",
+    "theme"
+  ],
+  "short_name": "Dark Chroma",
+  "version": "1.4"
 }