diff --git a/manifest.json b/manifest.json
index c88dc76..53e2d59 100644
--- a/manifest.json
+++ b/manifest.json
@@ -28,7 +28,7 @@
     "name": "Search and Replace",
     "description": "__MSG_ext_description__",
     "manifest_version": 3,
-    "permissions": ["activeTab", "storage", "notifications", "tabs"],
+    "permissions": ["activeTab", "storage", "notifications", "tabs", "scripting"],
     "host_permissions": ["http://*/*", "https://*/*"],
     "update_url": "http://clients2.google.com/service/update2/crx",
     "version":"2.3.0",
diff --git a/server.log b/server.log
new file mode 100644
index 0000000..ddbd402
--- /dev/null
+++ b/server.log
@@ -0,0 +1,8 @@
+
+> search_and_replace@2.3.0 start
+> light-server --no-reload -s . -p 9000 -w "**/*.html,**/*.css,**/*.js,**/*.gz"
+
+light-server is listening at http://0.0.0.0:9000
+  serving static dir: .
+
+## WARNING: Ignoring watch expression "**/*.html,**/*.css,**/*.js,**/*.gz", because it doesn't specify a command and live-reloading is disabled.
diff --git a/src/background/install.ts b/src/background/install.ts
index 0509170..2a73e01 100644
--- a/src/background/install.ts
+++ b/src/background/install.ts
@@ -2,13 +2,42 @@ import { LangList } from '../types'
 import { getAvailableLanguages } from '../util'
 import { getDefaultStorage } from './storage'
 
+// Content scripts to inject (must match manifest.json content_scripts)
+const CONTENT_SCRIPTS = ['searchreplace.js', 'options.js', 'popup.js', 'help.js', 'util.js', 'elements.js']
+
+// Inject content scripts into existing tabs
+async function injectContentScripts() {
+    try {
+        const tabs = await chrome.tabs.query({})
+        for (const tab of tabs) {
+            // Only inject into http(s) and file URLs (matching manifest.json)
+            if (tab.id && tab.url && (tab.url.startsWith('http://') || tab.url.startsWith('https://') || tab.url.startsWith('file://'))) {
+                try {
+                    for (const script of CONTENT_SCRIPTS) {
+                        await chrome.scripting.executeScript({
+                            target: { tabId: tab.id, allFrames: true },
+                            files: [script],
+                        })
+                    }
+                    console.debug(`BACKGROUND: Injected content scripts into tab ${tab.id}`)
+                } catch (error) {
+                    // Ignore errors for tabs where we can't inject (e.g., chrome:// URLs, extension pages)
+                    console.debug(`BACKGROUND: Could not inject into tab ${tab.id}:`, error)
+                }
+            }
+        }
+    } catch (error) {
+        console.error('BACKGROUND: Error injecting content scripts:', error)
+    }
+}
+
 export function listenerInstall(details: chrome.runtime.InstalledDetails) {
     if (details.reason === 'install') {
         chrome.notifications.create('install', {
             type: 'basic',
             title: 'Search and Replace',
             iconUrl: 'assets/icon-32.png',
-            message: 'Thanks for installing. Remember to REFRESH the page you wish to replace text on before using!',
+            message: 'Thanks for installing. You can now use Search and Replace on any open tabs!',
             priority: 2,
             buttons: [{ title: 'Ok' }],
         })
@@ -34,5 +63,13 @@ export function listenerInstall(details: chrome.runtime.InstalledDetails) {
                 })
             })
         })
+
+        // Inject content scripts into existing tabs
+        injectContentScripts()
+    }
+
+    // Also inject on update to ensure all tabs have the latest scripts
+    if (details.reason === 'update') {
+        injectContentScripts()
     }
 }