I had FF 65.0.2 and uBlock Origin 1.16.20 and everything worked. Updated to FF 66.0.2 and had some blocking issues. I updated to uBlock Origin 1.18.16 and pages loaded very slowly. I reset uBlock as was suggested elsewhere but it did not help. Rolled back to FF 65.0.2 and kept uBlock 1.18.16 and everything is. Oct 14, 2017 Anyone that has used Nightly recently will agree that Nighlty performs better than WF And FF. I can’t think of a single parameter where 52esr is better than v55, not one. I currently have WF, FF v56, and Nightly installed and I used FF ESR for a few years before updating to the release channel when v54 was released. EDIT: Based on your mention of FF 55, I'm now assuming you're working on your Vista system. I'm not 100% sure about Vista, but I know that for XP, the last FF version was 52.9.0 ESR. And for that, the last compatible uBlock Origin was 1.17.4. While uBlock recommends you use the latest version, you can still install older versions.
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