It's working again, thank you for fixing the issue so quickly. This is the best ad blocker by far.

If message "Download failed. Please check your connection" appears, try to update Firefox. Go to "Help" -> "About Firefox". Update to ver. 66.0.4 and restart Firefox.
Your addons can be enabled now. Works fine for me.

Thank you!

This is the best of its kind. Thank you @gorhill

Thanks to the developers for this great addon! It really works!

The latest release of uBlock Origin 1.18.17rc5 was installed and works fine for me [FF 56.0.2 x64].

But when trying to install previous versions, the message "This add-on could not be installed because it was not verified" or "This add-on could not be installed because it corrupted" appeared.

uBlock Origin 1.18.17rc5: https://github.com/gorhill/uBlock/releases/download/1.18.17rc5/uBlock0_1.18.17rc5.firefox.signed.xpi

Please correct your negative add-on rating that was caused by a known FF developers problem...

Corregido el error de archivo corrupto, muchas gracias.-