We've tested by adding the same URL provided as a URL rule in LastPass on a few different computers but aren't able to reproduce this issue (the URL rule is saved and the webpage doesn't freeze then the URL rule is added), our team would like to gather more information to hopefully reproduce this issue and resolve this, so that we can gather more specific details could you submit a bug report following the steps here? https://support.logmeininc.com/lastpass/help/how-do-i-report-a-bug-to-lastpass
RachelO is a member of the LogMeIn Community Care Team.
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