Toad-Hall, I can live with the 'accessibility.force_disabled' setting at 1. I use no add-ons, no calendar, no chat, just IMAP email. All I need is to send and receive HTML-friendly email. Maybe we need "Thunderbird Light" with no frills.

Again, many thanks for your patience and for uncovering the bug also reported by another. At least I know it's not something I am doing wrong.

I have the exact same problem. Thunderbird stops responding while composing a message in HTML. It started a couple of months ago when Thunderbird recommended that I change to the release update channel and a newer version was installed. I don't remember the older number nor the newer version number at that time. I was running Win10 Home at the time. I had been running Thunderbird for a few hears without a problem under Win10.

I have not found this Not Responding While Composing problem mentioned in a wider web search, only in this one report in this particular forum.

I have since updated my Dell XPS 8940 to Win11 Home. The Thunderbird problem continues under the new operating system.

As of today, I am using Thunderbird 141.0 (64-bit) on the release update channel. The problem has continued through a few Thunderbird updates and the update from Win10 to Win11.

As the OP describes, Thunderbird frequently stops responding when composing a message. I am able to click on X in the upper right corner of the main window to close Thunderbird. I save after every few words so after restarting Thunderbird I can continue composing from the saved drafft.

I have tried turning off hardware acceleration and running in Safe mode, but the problem persisted.

Perhaps I will have to remove Thunderbird completely from my computer and start over with a clean install. But I have a few years of data stored on my computer so I've been reluctant to do this as I don't know that this drastic measure would help.

Dell XPS 8940, Win 11 Home 24H2, NVIDIA GeForce RTX3060 (Studio driver 32.0.15.7700 updated 7/14/2025), 64 GB ram

Granddaddy, start with Toad-Hall's message on June 7, 2025. That disables some some Thunderbird features that I never use anyway (for me it is an email program, nothing more) but it does kill the bug.

Granddaddy, start with Toad-Hall's message on June 7, 2025. That disables some some Thunderbird features that I never use anyway (for me it is an email program, nothing more) but it does kill the bug.

Link to that comment: https://support.mozilla.org/en-US/questions/1514833#answer-1740015.

Hi Dan Landiss Can you please mark my comment as the Chosen Solution, so that people with same issue can find a current solution more easilly. Many Thanks. https://support.mozilla.org/en-US/questions/1514833#answer-1740015