diff --git a/background.ts b/background.ts
index 718b2a49..df8d1b2c 100644
--- a/background.ts
+++ b/background.ts
@@ -22,6 +22,7 @@ interface ContainerInfo {
   name: string | null;
   icon?: string;
   color?: string;
+  replace: boolean;
 }
 
 function toContainerInfo(value: any): ContainerInfo | undefined {
@@ -43,12 +44,15 @@ async function onBeforeRequest(
     return {};
   }
 
+  const tab = await browser.tabs.get(request.tabId);
+  const sourceUrl = tab.url ? new URL(tab.url) : undefined;
+
   const interpreter = new Sval({
     ecmaVer: "latest",
     sourceType: "script",
     sandBox: true,
   });
-  interpreter.import({ url: new URL(request.url) });
+  interpreter.import({ url: new URL(request.url), sourceUrl });
   interpreter.run(program);
 
   const info = toContainerInfo(interpreter.exports.end);
@@ -56,8 +60,6 @@ async function onBeforeRequest(
     return {};
   }
 
-  const tab = await browser.tabs.get(request.tabId);
-
   // Open in the default container (no container) if name is null.
   if (info.name === null) {
     if (!tab.cookieStoreId || tab.cookieStoreId === DEFAULT_COOKIE_STORE_ID) {
@@ -69,7 +71,9 @@ async function onBeforeRequest(
       cookieStoreId: DEFAULT_COOKIE_STORE_ID,
     });
 
-    await browser.tabs.remove(request.tabId);
+    if (info.replace != false) {
+      await browser.tabs.remove(request.tabId);
+    }
 
     return { cancel: true };
   }
@@ -97,7 +101,9 @@ async function onBeforeRequest(
   });
 
   // Close the old tab
-  await browser.tabs.remove(request.tabId);
+  if (info.replace !== false) {
+    await browser.tabs.remove(request.tabId);
+  }
 
   return { cancel: true };
 }
diff --git a/manifest.json b/manifest.json
index 7e241f7a..03c78c0b 100644
--- a/manifest.json
+++ b/manifest.json
@@ -1,7 +1,7 @@
 {
   "manifest_version": 2,
   "name": "ContainerScript",
-  "version": "1.2",
+  "version": "1.3",
   "description": "User defined scripts for assining URLs to containers",
   "permissions": [
     "<all_urls>",
diff --git a/ui.html b/ui.html
index 3e089f53..31862682 100644
--- a/ui.html
+++ b/ui.html
@@ -101,17 +101,44 @@ <h1>Container Script</h1>
 				<div class="instructions-content">
 					<p>
 						Write JavaScript code to define container rules.
-						The code runs each time you open a URL, with the <code>url</code> variable (an instance of the <a href="https://developer.mozilla.org/en-US/docs/Web/API/URL">URL</a> class) available in scope.
+						The code runs each time you navigate to a URL. Two variables are available:
+					</p>
+					<ul style="color: #34495e; line-height: 1.8; margin-bottom: 15px;">
+						<li><code>url</code> &mdash; the <a href="https://developer.mozilla.org/en-US/docs/Web/API/URL">URL</a> being navigated to.</li>
+						<li><code>sourceUrl</code> &mdash; the URL of the page that initiated the navigation (may be <code>undefined</code> for new tabs).</li>
+					</ul>
+					<p>
 						The code is executed using <a href="https://github.com/Siubaak/sval">Sval</a> due to <a href="https://www.w3.org/TR/CSP/">CSP</a> restrictions.
 					</p>
 					<h3>Basic Usage</h3>
-					<p>Return a string to open the URL in that container:</p>
+					<p>Return a string to open the URL in that container (replaces the current tab):</p>
 					<p><code>if (url.hostname === "www.amazon.com") return "shopping";</code></p>
 					<p>Return <code>null</code> to open the URL in the default container (no container):</p>
 					<p><code>if (url.hostname === "github.com") return null;</code></p>
 					<h3>Advanced Configuration</h3>
-					<p>Return an object for more control over the container:</p>
-					<p><code>if (url.toString().includes("bank.com")) return { name: "finance", icon: "fingerprint", color: "blue" }; </code></p>
+					<p>Return an object for more control. Use <code>name</code> (or <code>profile</code>) for the container name, and <code>replace</code> to control whether the original tab is closed:</p>
+					<p><code>if (url.toString().includes("bank.com")) return { name: "finance", icon: "fingerprint", color: "blue" };</code></p>
+					<p>Keep the original tab open by setting <code>replace</code> to <code>false</code>:</p>
+					<p><code>if (url.hostname === "example.com") return { name: "work", replace: false };</code></p>
+					<p>Use <code>sourceUrl</code> to keep the original tab open when navigating from a specific site (e.g. Google):</p>
+<pre style="background-color: #f8f9fa; padding: 12px 16px; border-radius: 3px; font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace; font-size: 0.9em; color: #e83e8c; line-height: 1.6; overflow-x: auto;"><code>
+let replace = true;
+switch (sourceUrl?.hostname) {
+    case "www.google.com":
+    case "duckduckgo.com":
+    case "www.bing.com":
+        replace = false;
+}
+
+switch (url.hostname) {
+    case "www.youtube.com":
+    case "chatgpt.com":
+    case "www.reddit.com":
+        return { name: "Personal", replace };
+}
+
+return null;
+</code></pre>
 				</div>
 			</details>
 		</div>
diff --git a/ui.ts b/ui.ts
index 92e1b2ed..de742a49 100644
--- a/ui.ts
+++ b/ui.ts
@@ -11,12 +11,16 @@ async function main() {
     },
   };
 
-  // setup the url parameter for auto-complete
+  // setup auto-complete for available variables
   const libSource = [
     "/**",
-    " * The URL we're finding a container for",
+    " * The URL being navigated to",
     " */",
     "declare const url: URL",
+    "/**",
+    " * The URL of the page that initiated the navigation (may be undefined for new tabs)",
+    " */",
+    "declare const sourceUrl: URL | undefined",
   ].join("\n");
   const libUri = "ts:filename/ContainerScript.d.ts";
   monaco.languages.typescript.javascriptDefaults.addExtraLib(libSource, libUri);