Unfortunately, this is an issue that you will come across with certain websites no matter what browser you are using. This is simply poor design on the website.

Facebook Messenger is a great example of this. What Facebook Messenger does is load all of the messages in a scrollable box (known as a DIV). This is great for viewing, but it's not printable because that box can't be resized based on the content within it. Therefore, since the box is set to always be as tall as the screen, it's only going to be as tall as the page when you print it.

It's pretty common to come across this with some web email services, which is why those services usually have their own builtin print button. However, Facebook has not done the same in their Messenger service.

Unfortunately, it's very difficult to get around without manually copying, pasting and formatting all of the messages in a word processor. I've not come across any extensions that have been able to solve the issue.

This can't be true because I have always happily printed emails, web pages etc using Firfox until a couple of weeks ago (approx beginning August 19). HP says printer fine. BT Yahoo mail seems unable to even address the problem. I have tried the steps decribed to assist printing. If this has always been a problem then it has taken several years to emerge. It is infuriating. I will end up having to use another browser (which is what is wanted by other browsers) but see no need if it could work in the past it can now Please help

Hi LostHope, first, in order to print the selection, press Ctrl+p -- that is, go straight to the print dialog instead of going through Preview. Then there should be a Selection option in the print range section of the dialog.

I think someone else mentioned problems printing from the latest Yahoo layout. I haven't been over there to check it out yet. I assume you are using their most "print-optimized" layout by selecting Print from a menu in the page or clicking a printer icon in the page?

As websites update, more are adopting a "flex" layout. Firefox works well with these layouts on the screen, but treats them as "unbreakable" when printing. As a result, Firefox will just run them off the bottom of the page when they are too long. This is pending in the bug tracking system, but I really don't know whether it will get fixed soon (soon meaning this year).

As a workaround, I created an add-on which overrides some of the common reasons that Firefox can't break content across pages. It's definitely not perfect, but I find it useful several times a week. If you want to give it a try:

https://addons.mozilla.org/firefox/addon/printable-the-print-doctor/

Hi LostHope, circling back to Yahoo mail.

After you click the print icon to pop up the small window with the print-formatted message, Yahoo triggers a print dialog. Cancel that dialog. Then right-click a blank area of the page and use

Printable - The Print Doctor > Override unbreakable display types

Then the message should preview and print with most or all of its content.

Note: that menu item is added by version 0.8 of my extension: https://addons.mozilla.org/firefox/addon/printable-the-print-doctor/