Hello, I am using an OpenSuse 42.2 system. Around a week back, I upgraded to Thunderbird 78.6.0 by doing a manual install, since support for automatic update by opensuse is not availabe as the system is old. I am using a Dell Inspiron 15 7579 laptop. After a few days of downloading all old mails on POP3 from various mailboxes, I started facing the problem of my computer hanging suddenly. The keyboard, display freezes and if left as it is it stays the same way for hours together. The only way of coming out of the situation is to do a hard reset by pushing the power button of the laptop. I used to face similar problems in Firefox, but it was not that frequent and a recent update from Firefox version to the latest version with a manual install helped in resolving this issue. I managed to capture the error message which appeared a couple of times after a few hours on my mobile and am attaching the same. The error codes in each instance are different. On searching through the forums, I learnt that sometimes the addons to Thunderbird can cause such problems and the solution given was to restart Thunderbird with the addons disabled. I did the same, but the problem remained. The only addons that I had enabled was TBSync, CalDAV, Provided for Google Calendar and Google Calendar Tab. I have also disabled all the addons, but the problem persists. Over the last few days, I have been able to work on my laptop for less than a couple of hours (without Thunderbird running) due to this issue. I also checked the Tools - WebDeveloper for error messages and found the following: [Exception... "Component returned failure code: 0x80520001 (NS_ERROR_FILE_UNRECOGNIZED_PATH) [nsIXPCComponents_Utils.readUTF8URI]" nsresult: "0x80520001 (NS_ERROR_FILE_UNRECOGNIZED_PATH)" location: "JS frame :: resource://gre/modules/L10nRegistry.jsm :: L10nRegistry.loadSync :: line 658" data: no] L10nRegistry.jsm:658:19 Successfully loaded OpenPGP library librnp.so from /opt/thunderbird78/thunderbird/librnp.so RNPLib.jsm:49:13 public keys: 0, secret keys: 0 RNPLib.jsm:247:15 [Exception... "Component returned failure code: 0x80520001 (NS_ERROR_FILE_UNRECOGNIZED_PATH) [nsIXPCComponents_Utils.readUTF8URI]" nsresult: "0x80520001 (NS_ERROR_FILE_UNRECOGNIZED_PATH)" location: "JS frame :: resource://gre/modules/L10nRegistry.jsm :: L10nRegistry.loadSync :: line 658" data: no] L10nRegistry.jsm:658:19 [Exception... "Component returned failure code: 0x80520001 (NS_ERROR_FILE_UNRECOGNIZED_PATH) [nsIXPCComponents_Utils.readUTF8URI]" nsresult: "0x80520001 (NS_ERROR_FILE_UNRECOGNIZED_PATH)" location: "JS frame :: resource://gre/modules/L10nRegistry.jsm :: L10nRegistry.loadSync :: line 658" data: no] L10nRegistry.jsm:658:19 [Exception... "Component returned failure code: 0x80520001 (NS_ERROR_FILE_UNRECOGNIZED_PATH) [nsIXPCComponents_Utils.readUTF8URI]" nsresult: "0x80520001 (NS_ERROR_FILE_UNRECOGNIZED_PATH)" location: "JS frame :: resource://gre/modules/L10nRegistry.jsm :: L10nRegistry.loadSync :: line 658" data: no] L10nRegistry.jsm:658:19 [Exception... "Component returned failure code: 0x80520001 (NS_ERROR_FILE_UNRECOGNIZED_PATH) [nsIXPCComponents_Utils.readUTF8URI]" nsresult: "0x80520001 (NS_ERROR_FILE_UNRECOGNIZED_PATH)" location: "JS frame :: resource://gre/modules/L10nRegistry.jsm :: L10nRegistry.loadSync :: line 658" data: no] L10nRegistry.jsm:658:19 Successfully loaded OTR library libotr.so.5 from /opt/thunderbird78/thunderbird/libotr.so.5 OTRLib.jsm:43:13 I am not able to make out anything out of these errors. I have been using Thunderbird (as well as Firefox) since its inception in 2004 except for the last 3 years when I was using Evolution. I hate to give up on Thunderbird and request for support to find out what causes the Frequent Unresponsive Script Error. PS: As an afterthought, as a remote chance, could the issue be due to some hardware problems on the laptop. I am not sure since I am not facing any other problems in any other application except for some noise due to the fan. Regards N. Sridhar