Allow re-activating fresh Chromium browsers

This is useful because if you have an old process running, it's easy to
lose it (especially on Mac, where it may be invisible) and this provides
an easy way to ping it back into the foreground.

src/interceptors/chromium-based-interceptors.ts

@@ -96,7 +96,7 @@ abstract class FreshChromiumBasedInterceptor implements Interceptor {
     }
 
     async activate(proxyPort: number, options: { webExtensionEnabled?: boolean } = {}) {
-        if (this.isActive(proxyPort)) return;
+        const alreadyActive = this.isActive(proxyPort);
 
         const hideWarningServer = new HideWarningServer(this.config);
         await hideWarningServer.start('https://amiusing.httptoolkit.tech');
@@ -119,6 +119,8 @@ abstract class FreshChromiumBasedInterceptor implements Interceptor {
         await hideWarningServer.completedPromise;
         await hideWarningServer.stop();
 
+        if (alreadyActive) return; // If we're just opening a new tab, we're done, don't track the process.
+
         this.activeBrowsers[proxyPort] = browser;
         browser.process.once('close', async () => {
             delete this.activeBrowsers[proxyPort];