>>> My Info: Win7_64, Nightly 49, 32bit, ID 20160511030221 STR_1: 1. Launch PC, launch Firefox 2. Click Australis menu -> [?] -> Troubleshooting information AR: The whole browser becomes unresponsive for ~25 seconds ER: The browser shouldn't lag. The page shouldn't lag.

User Agent Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:54.0) Gecko/20100101 Firefox/54.0 Build ID 20170130030205 I wasn't able to reproduce the issue on the latest Firefox Release (51.0.1), on the latest Nightly (54.0a1) or on Nightly 49.0a1 (20160511030221). The browser doesn't become unresponsive at all. Since the reporter's account is disabled and I cannot reproduce, I will mark the issue as Resolved-Incomplete. If anyone can still reproduce on the latest Firefox version, please feel free to reopen and provide more information.