Win X
 Major  Minor  Build  Revision
 -----  -----  -----  --------
 10     0      16299  0

 60.3.0esr (32-bit)

Expected behavior (observed yesterday under the same conditions except it was near but < 1000 requests): Open network monitor, enable persistent logs, capture traffic, when at a satisfactory point - right click request list, save all as HAR, har file saved containing information on each request. Observed behavior at 1110 requests: Open network monitor, enable persistent logs, capture traffic, when at a satisfactory point - right click request list, save all as HAR, dialog shows 9 bytes will be saved, file saved says "undefined" Question: Is there a cap on how many requests one may archive in a session? If not, what would the "undefined" error be coming from? Is there a way I can fix this without losing everything I've logged so far? I didn't find anything that talks about the functionality of Network Monitor beyond its explanation here (https://developer.mozilla.org/en-US/docs/Tools/Network_Monitor/request_list). How to use it vs how it works and whatnot. OS: Win X Major Minor Build Revision ----- ----- ----- -------- 10 0 16299 0 Browser: 60.3.0esr (32-bit)