Hi jonwww, thanks for sharing your thoughts with us! I'm not sure why you got that error. AdBlock works fine with the latest version of Firefox. Would you mind opening a ticket on our support site, https://help.getadblock.com? I'd like to look into this for you. Thanks!

- Rhana, AdBlock Community Manager

Thanks for letting us know. Oftentimes, high memory usage like this can be the result of having a large number of filter lists enabled. Do you happen to know how many you have enabled? If it's more than 3 or 4, you can experiment with some of the filter lists to see if that helps.

Thanks.
The AdBlock Team