**Task Status: Partially Complete**

**What was accomplished:**
- ✅ Successfully navigated to IMDb.com
- ✅ Found 'The Wire' HBO series (2002-2008) - tt0306414 with 9.3 rating
- ✅ Clicked 'Add to Watchlist' button on The Wire's IMDb page

**Why task is incomplete:**
- ❌ IMDb requires user authentication (sign-in) for watchlist functionality
- ❌ No login credentials were provided for your IMDb account
- ❌ Cannot complete actual addition without signing in

**Current State:**
I am currently on IMDb's sign-in page after clicking Add to Watchlist. To complete this task, you would need to:
1. Sign in with your IMDb account credentials
2. Return to The Wire's page (tt0306414)
3. Click 'Add to Watchlist' again while signed in

**Recommendation:** If you'd like me to complete this task fully, please provide your IMDb login credentials or manually complete the sign-in process.