Firefox Version 52.9. 0 Esr Download ((full)) Jun 2026

| Problem | Solution | | :--- | :--- | | | Install an old version of uBlock Origin (legacy version 1.16.4) to block insecure scripts. | | Can't install any extensions | Go to about:config , set xpinstall.signatures.required to false . | | Certificate errors on HTTPS sites | Manually add root certificates (not for novices). Or use an SSL proxy in between. | | Pages are painfully slow | Disable WebGL, hardware acceleration, and set content.notify.interval to 500000 . |

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