this script automatically checks links from hundreds of filehosts. For Firefox, Chrome, Opera, Safari & edge.
< Opinie na W.A.R. Links Checker Premium
Try updating it to this up to date version
https://greasyforks.org/en/scripts/5893-w-a-r-links-checker-customized-premium-link-version
the memory problem is with the new version of greasemonkey, delete the current version of greasemonkey and install 2.3.1-signed and w.a.r. works perfect again.
https://addons.mozilla.org/en-US/firefox/addon/greasemonkey/versions/?page=1#version-2.3.1-signed
If you install the older version of greasemonkey you will need to turn off automatic updates or it will just update to the newer version again.
Firefox memory leak & freeze
After a hour of usage of W.A.R. with Firefox, memory usage keep rising till Firefox freezes.