feat(browser): improve browser profile management and cleanup

Enhance browser profile handling with better process cleanup and documentation:
- Add process cleanup for existing Chromium instances on Windows/Unix
- Fix profile creation by passing complete browser config
- Add comprehensive documentation for browser and CLI components
- Add initial profile creation test
- Bump version to 0.6.3

This change improves reliability when managing browser profiles and provides better documentation for developers.

crawl4ai/__version__.py

@@ -1,3 +1,3 @@
 # crawl4ai/_version.py
-__version__ = "0.6.2"
+__version__ = "0.6.3"
 

crawl4ai/browser_manager.py

@@ -5,7 +5,10 @@ import os
 import sys
 import shutil
 import tempfile
+import psutil  
+import signal
 import subprocess
+import shlex
 from playwright.async_api import BrowserContext
 import hashlib
 from .js_snippet import load_js_script
@@ -193,6 +196,45 @@ class ManagedBrowser:
         
         if self.browser_config.extra_args:
             args.extend(self.browser_config.extra_args)
+            
+
+        # ── make sure no old Chromium instance is owning the same port/profile ──
+        try:
+            if sys.platform == "win32":
+                if psutil is None:
+                    raise RuntimeError("psutil not available, cannot clean old browser")
+                for p in psutil.process_iter(["pid", "name", "cmdline"]):
+                    cl = " ".join(p.info.get("cmdline") or [])
+                    if (
+                        f"--remote-debugging-port={self.debugging_port}" in cl
+                        and f"--user-data-dir={self.user_data_dir}" in cl
+                    ):
+                        p.kill()
+                        p.wait(timeout=5)
+            else:  # macOS / Linux
+                # kill any process listening on the same debugging port
+                pids = (
+                    subprocess.check_output(shlex.split(f"lsof -t -i:{self.debugging_port}"))
+                    .decode()
+                    .strip()
+                    .splitlines()
+                )
+                for pid in pids:
+                    try:
+                        os.kill(int(pid), signal.SIGTERM)
+                    except ProcessLookupError:
+                        pass
+
+                # remove Chromium singleton locks, or new launch exits with
+                # “Opening in existing browser session.”
+                for f in ("SingletonLock", "SingletonSocket", "SingletonCookie"):
+                    fp = os.path.join(self.user_data_dir, f)
+                    if os.path.exists(fp):
+                        os.remove(fp)
+        except Exception as _e:
+            # non-fatal — we'll try to start anyway, but log what happened
+            self.logger.warning(f"pre-launch cleanup failed: {_e}", tag="BROWSER")            
+            
 
         # Start browser process
         try:
@@ -922,7 +964,7 @@ class BrowserManager:
             pages = context.pages
             page = next((p for p in pages if p.url == crawlerRunConfig.url), None)
             if not page:
-                page = await context.new_page()
+                page = context.pages[0] # await context.new_page()
         else:
             # Otherwise, check if we have an existing context for this config
             config_signature = self._make_config_signature(crawlerRunConfig)

crawl4ai/browser_profiler.py

@@ -140,13 +140,17 @@ class BrowserProfiler:
         self.logger.info("4. The profile will be saved and ready to use with Crawl4AI.", tag="PROFILE")
         self.logger.info(f"{border}\n", tag="PROFILE")
         
+        browser_config.headless = False
+        browser_config.user_data_dir = profile_path
+        
+        
         # Create managed browser instance
         managed_browser = ManagedBrowser(
-            browser_type=browser_config.browser_type,
-            user_data_dir=profile_path,
-            headless=False,  # Must be visible
+            browser_config=browser_config,
+            # user_data_dir=profile_path,
+            # headless=False,  # Must be visible
             logger=self.logger,
-            debugging_port=browser_config.debugging_port
+            # debugging_port=browser_config.debugging_port
         )
         
         # Set up signal handlers to ensure cleanup on interrupt
@@ -972,3 +976,30 @@ class BrowserProfiler:
             'info': browser_info
         }
 
+
+if __name__ == "__main__":
+    # Example usage
+    profiler = BrowserProfiler()
+    
+    # Create a new profile
+    import os
+    from pathlib import Path
+    home_dir = Path.home()
+    profile_path = asyncio.run(profiler.create_profile( str(home_dir / ".crawl4ai/profiles/test-profile")))
+
+        
+            
+    # Launch a standalone browser
+    asyncio.run(profiler.launch_standalone_browser())
+    
+    # List profiles
+    profiles = profiler.list_profiles()
+    for profile in profiles:
+        print(f"Profile: {profile['name']}, Path: {profile['path']}")
+    
+    # Delete a profile
+    success = profiler.delete_profile("my-profile")
+    if success:
+        print("Profile deleted successfully")
+    else:
+        print("Failed to delete profile")