is it possible to have two options for viewing html mail?

[José María Mateos]

On Sat, Oct 24, 2020 at 08:54:18PM +0000, Globe Trotter via Mutt-users wrote:
>Lots of people send me mail in HTML format (even though I do not like it). I have the following set up in my .mailcap:
>
>text/html; w3m -I %{charset} -T text/html; copiousoutput
>
>so it converts things using w3m more or less okay, however, I am wondering is it possible to have an option for viewing using midori/firefox for the cases where w3m is not enough?

Yes. In .muttrc:

bind attach <Return> view-mailcap # if you want to see html content using Return.

Then in your .mailcap:

text/html;  mutt_bgrun /usr/bin/firefox %s >/dev/null 2>&1; needsterminal
text/html; elinks -dump ; copiousoutput

The second link is the equivalent to your w3m (I use elinks). The second 
one is a script I found some time ago. You can get a copy here, for 
example https://github.com/RichiH/mutt_bgrun. It saves the html file in 
a temp folder, runs firefox and deletes the file.

Then, to use this, just go to the list of attachments in the message, 
select the HTML file, press Enter and you should have the message in a 
new firefox tab.

Cheers,

-- 
José María (Chema) Mateos || https://rinzewind.org