diff --git a/entrypoints/sidepanel/utils/opener.ts b/entrypoints/sidepanel/utils/opener.ts
index 037658a..2acba4f 100644
--- a/entrypoints/sidepanel/utils/opener.ts
+++ b/entrypoints/sidepanel/utils/opener.ts
@@ -68,13 +68,10 @@ async function createGroup(group: GroupItem, windowId: number, discard?: boolean
 		createProperties: { windowId }
 	});
 
-	// Grouping support came in 138, tabGroups is expected to be in 139
-	// TODO: Remove this check once the API is available
-	if (!import.meta.env.FIREFOX)
-		await chrome.tabGroups.update(groupId, {
-			title: group.title,
-			color: group.color
-		});
+	await chrome.tabGroups.update(groupId, {
+		title: group.title,
+		color: group.color
+	});
 }
 
 async function manageWindow(handle: (windowId: number) => Promise<void>, windowProps?: Windows.CreateCreateDataType): Promise<void>
diff --git a/package.json b/package.json
index e9262f7..7ef97c5 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
 	"name": "tabs-aside",
 	"private": true,
-	"version": "3.0.0-rc4",
+	"version": "3.0.0-rc5",
 	"type": "module",
 	"scripts": {
 		"dev": "wxt",
diff --git a/utils/saveTabsToCollection.ts b/utils/saveTabsToCollection.ts
index b887b67..f6d9f1e 100644
--- a/utils/saveTabsToCollection.ts
+++ b/utils/saveTabsToCollection.ts
@@ -88,17 +88,9 @@ async function createCollectionFromTabs(tabs: Tabs.Tab[]): Promise<[CollectionIt
 		tabs.every(i => i.groupId === tabs[0].groupId)
 	)
 	{
-		// TODO: Remove the check when Firefox 139 is out
-		if (!import.meta.env.FIREFOX)
-		{
-			const group = await browser.tabGroups!.get(tabs[0].groupId);
-			collection.title = group.title;
-			collection.color = group.color;
-		}
-		else
-		{
-			collection.color = "blue";
-		}
+		const group = await chrome.tabGroups.get(tabs[0].groupId);
+		collection.title = group.title;
+		collection.color = group.color;
 
 		tabs.forEach(i =>
 			collection.items.push({ type: "tab", url: i.url!, title: i.title })
@@ -123,27 +115,14 @@ async function createCollectionFromTabs(tabs: Tabs.Tab[]): Promise<[CollectionIt
 		if (!activeGroup || activeGroup !== tab.groupId)
 		{
 			activeGroup = tab.groupId;
+			const group = await chrome.tabGroups.get(activeGroup);
 
-			// TODO: Remove the check when Firefox 139 is out
-			if (import.meta.env.FIREFOX)
-			{
-				collection.items.push({
-					type: "group",
-					color: "blue",
-					items: []
-				});
-			}
-			else
-			{
-				const group = await browser.tabGroups!.get(activeGroup);
-
-				collection.items.push({
-					type: "group",
-					color: group.color,
-					title: group.title,
-					items: []
-				});
-			}
+			collection.items.push({
+				type: "group",
+				color: group.color,
+				title: group.title,
+				items: []
+			});
 		}
 
 		(collection.items[collection.items.length - 1] as GroupItem).items.push({
diff --git a/wxt.config.ts b/wxt.config.ts
index 9a50271..b84182d 100644
--- a/wxt.config.ts
+++ b/wxt.config.ts
@@ -24,7 +24,8 @@ export default defineConfig({
 			description: "__MSG_manifest_description__",
 			homepage_url: "https://github.com/xfox111/TabsAsideExtension/",
 
-			action: {
+			action:
+			{
 				default_title: "__MSG_manifest_name__"
 			},
 
@@ -36,7 +37,8 @@ export default defineConfig({
 					"tabs",
 					"notifications",
 					"contextMenus",
-					"bookmarks"
+					"bookmarks",
+					"tabGroups"
 				],
 
 			commands:
@@ -78,17 +80,13 @@ export default defineConfig({
 				gecko:
 				{
 					id: "tabsaside@xfox111.net",
-					strict_min_version: "138.0"
+					strict_min_version: "139.0"
 				}
 			};
 
 			// @ts-expect-error author key in Firefox has a different format
 			manifest.author = "__MSG_manifest_author__";
 		}
-		else
-		{
-			manifest.permissions!.push("tabGroups");
-		}
 
 		return manifest;
 	}