uBlock Origin has recently faced significant issues working on YouTube due to frequent updates by YouTube’s ad script technology, changes in browser extension frameworks, and outdated filter lists within uBlock Origin itself.
Many users have reported that ads are bypassing the ad blocker or that videos won’t play properly when the extension is enabled.
Main Reasons for Malfunction
YouTube’s Ad Script Updates: YouTube continuously modifies its methods to serve ads, making it difficult for blockers like uBlock Origin to keep up.
Outdated Filter Lists: If your filter lists aren’t updated, new ad formats may sneak past uBlock Origin.
Manifest V3 Migration: Recent browser updates (especially Chrome and Edge) now require extensions to use Manifest V3, which limits or breaks many legacy ad blocking features.
Cached Data and Conflicting Extensions: Cookies, cached data, or interference by other extensions can cause the ad blocker to malfunction.
YouTube Account Issues: Some users see ads only when logged into their account due to how ads are personalized.
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Troubleshooting Steps
Update Filter Lists: Go to uBlock Origin’s settings and refresh all filter lists for the latest ad-blocking rules.
Clear Browser Cache and Cookies: This helps eliminate outdated data that could cause extension conflicts.
Check Browser Updates: If you recently updated your browser, check if uBlock Origin still supports it or if you need to manually reinstall or update the extension.
Enable Experimental Flags (Chromium/Chrome):
Turn on flags for “temporarily unexpire M139” and “allow legacy extension manifest versions” before loading unpacked extensions, especially in newer Chrome/Edge versions.
Use Developer Mode to Manually Install Extension: Installing uBlock Origin manually in developer mode may help bypass restrictions in Chrome v139 and above.
Consider Alternate Browsers: Firefox continues to offer the best support for content-blocking extensions due to its open API and strong privacy stance.
Disable Conflicting Extensions: Disable other ad blockers or extensions that might interfere with uBlock Origin.
Try Logging Out: Some users experience fewer issues when logged out of their YouTube account.
Alternatives
If these steps don’t resolve the issue, you may need to consider using specialized privacy browsers such as Firefox or community-supported forks of uBlock Origin designed for Manifest V3 or legacy versions.
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