uBlock Origin Can't Block Facebook Ads

The difficulty in blocking Facebook ads with uBlock Origin (uBO) stems from Meta's aggressive engineering tactics, particularly their use of randomized CSS classes and dynamic element injection. When you block a specific ad container, Facebook changes its identifier in subsequent sessions, making static filter rules ineffective. Here’s how to address this:

1. Update Filter Lists Regularly

Filter lists aren’t updated in real-time, so manual refreshes are necessary:

• ·Open the uBO Dashboard (click the uBO icon → Gears icon).
• ·Navigate to the Filter lists tab.
• ·Click "Purge all caches" followed by "Update now."
• ·Refresh Facebook.

2. Enable Specialized Filter Lists

Basic lists like EasyList may miss Facebook-specific updates. Ensure these are active:

• ·uBlock filters – Quick fixes (for rapid patches).
• ·AdGuard – Social (targets social media ads).

3. Use the Element Picker Strategically

For persistent ads, manually target the ad’s container (not the ad itself) to avoid dynamic class names:

• ·Click uBO’s eye-dropper icon.
• ·Hover over the ad’s root container (e.g., the block with "Sponsored" text).
• ·Avoid rules with random strings (e.g., .x1i10hfl).
• ·Click Create.

4. Pair with Tampermonkey for Anti-Adblock Scripts

If uBO alone fails, use a Tampermonkey script (e.g., "Facebook Ad Remover" from GreasyFork) to delete "Sponsored" content at the HTML level, bypassing CSS obfuscation.

Why This Works

Verdict: uBO can block Facebook ads, but Meta’s constant changes demand proactive maintenance—regular list updates, strategic element blocking, and sometimes supplemental tools.