Is that email a reply to an ongoing conversation which has a lot of replies between you and the sender? If yes, how many emails are in the thread of that conversation?

Are you able to share this email?

I can only provide a photo of this email

Thanks.

We would likely need a sample for a developer to have a chance at fixing this. Can you sanitize one of your examples, that would still crash, to be shared?

Info from image. Vertical scrollbar on right only shows about one fifteenth (approx) of content. Blue line on left shows replies in this email.

It is possible this email has been used as reply on several occasions and contains all other replies within the email.

It would be helpful if you could save the email to your desktop as a .eml or .txt file which you could edit out email addresses (right click on email in list and use the 'Save as' option) and then attach the file in this bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1461124

The 'Attach file' is located at the top of the conversation below the 'Details' section.

SOME I CAN NOT ACCESS EMAIL BECAUSE IT IS A CORRESPONDENEMENT

k.radoch said

SOME I CAN NOT ACCESS EMAIL BECAUSE IT IS A CORRESPONDENEMENT

Sorry, I don't understand what this means.

I can not share this email because it is company correspondence and confidential data is contained there

Can you replace sensitive text with XXXX ?