"Chrome" is geek speak for some of the styling and decoration of your program; think of the shiny bits added to a 50's car, like the door handles, fenders, window trim etc. It doesn't, in this usage, imply the Google Chrome browser.

My immediate reaction to a word like "script" in an error message is to assume it refers to something like automation or an addon, but again, in Thunderbird, this is also misleading. Thunderbird uses a core of C++ for its fundamental operation, but the whole thing is held together by javascript, so references to scripts often just point to regular operation.

However, your error message specifically mentions the Calendar. Do you use the Lightning calendar in Thunderbird? If not, you could try disabling it. If you do wish to continue using the calendar, perhaps setting it to a different view may help. Or set the search/filter function to a smaller range of dates.

We do know that calendar usage, particularly with a "busy" calendar can impact on Thunderbird's overall performance. The script warning may be just its way of telling us it has a lot on its hands and will take some time to generate the Calendar view.

Thank you very much, Zenos, for responding to my question. I'm computer programs illiterate and it will take me some time to investigate & try to correct this issue. I don't even know how to identify if I'm using the Lightning calendar or not. I do wish to continue using the calendar to only alert me to upcoming tasks and/or events. Thank you again. You have given me important information to work from.

I searched in 'Help' - 'Troubleshooting information' in the Thuderbird program and found this:

Extensions Name Version Enabled ID Lightning 5.4.2.1 true {e2fda1a4-762b-4020-b5ad-a41df1933103}

Is this the Lightning Calendar?

Thank you again.

Yes. The Lightning calendar is now included by default. When you run Thunderbird for the very first time, just after installing it, you would be asked if you want to keep the calendar or not. Thereafter, Thunderbird should remember your preference.

It does seem odd that it's giving this problem for someone who clearly is not making active use of the calendar.

You can disable it or even remove it entirely under Tools|Add-ons|Extensions. Disabling it (temporarily) might be a useful troubleshooting step.

Hello again, Zenos. I AM using the calendar actively. I use it to alert me to upcoming events & tasks.

How do I troubleshoot it after disabling it?

Thank you.

See also https://support.mozilla.org/en-US/questions/1168649#answer-996816

Does starting in saef mode help?

If it does, lighting addon the problem? And if Lighting is the problem, what calendars and calendar types do you have running?

Thank you all for your responses and information. I don't know exactly what happened, or how it happened, but the problem cleared up. You have all helped. thank you!

This has been an ongoing problem for me for months now. I wake my computer from hibernation and I get an unresponsive calendar script about 40% of the time. I *never* use the calendar. Never have. So I'll figure out how to disable it. But just wanted to add onto this report that this is indeed an issue. I never added any custom addons to Thunderbird, so this is the as-bundled Lightning.

"Script: chrome://calendar/content/calendar-multiday-view.xml:3128"

Zyst said

This has been an ongoing problem for me for months now. I wake my computer from hibernation and I get an unresponsive calendar script about 40% of the time. I *never* use the calendar. Never have. So I'll figure out how to disable it. But just wanted to add onto this report that this is indeed an issue. I never added any custom addons to Thunderbird, so this is the as-bundled Lightning. "Script: chrome://calendar/content/calendar-multiday-view.xml:3128"

removing calendar addon might solve your issue.

But beyond that, waking a computer from hibernation is highly disk intensive, and Thunderbird is highly sensitive to slow disk operations. So it is not surprising you would experience Unresponsive Script while the wake process is still happening.

A bit more detail from a different user, new to this conversation:

I do use Lightning, and it works just fine for my own google calendars, but it has this exact problem with someone else's calendar that is shared from their google account to mine (free/busy information only). I disable the shared calendar, and it works; I enable it, and it hangs. Every time.

Two different machines do this: one running Ubuntu 16.04 LTS and the other Windows 10. Both are fully updated.