Add first-install prompt

src/_locales/en/messages.cson

@@ -25,4 +25,6 @@ general:
 excludePinnedTabs:
 	message: 'Exclude pinned tabs'
 discardInactiveTabs:
-	message: 'Unload inactive tabs after switching groups'
+	message: 'Unload inactive tabs after switching groups'
+enableBrowserRestoreSessionDesc:
+	message: 'Please enable "Restore previous session" in Firefox options.'

src/_locales/zh_CN/messages.cson

@@ -25,4 +25,6 @@ general:
 excludePinnedTabs:
 	message: '排除已固定标签页'
 discardInactiveTabs:
-	message: '切换群组后不载入非活动标签页'
+	message: '切换群组后不载入非活动标签页'
+enableBrowserRestoreSessionDesc:
+	message: '请在火狐选项中启用“恢复先前的浏览状态”。'

src/background/background.ts

@@ -14,3 +14,8 @@ export class BackgroundRemote {
 	}
 }
 registerRemoteHandler(new BackgroundRemote)
+
+browser.runtime.onInstalled.addListener(({ reason, temporary }) => {
+	if (reason === 'install' && !temporary)
+		browser.tabs.create({ url: '/pages/first-install.html' });
+})

src/pages/first-install.pug

@@ -0,0 +1,8 @@
+extends ../common/base.i.pug
+append head
+	link(rel="stylesheet" href="first-install.css")
+append body
+	h1(data-i18n='extensionName')
+	h2(data-i18n='enableBrowserRestoreSessionDesc')
+	img(src='./first-install.png' alt='Screenshot' width='960')
+	script(type='module' src='first-install.js')

src/pages/first-install.styl

@@ -0,0 +1,2 @@
+body
+	text-align: center

src/pages/first-install.ts

@@ -0,0 +1,3 @@
+import { applyI18n } from "../util/webext/i18n.js";
+
+applyI18n()