I have installed a Firefox plugin many years ago that used Greasemonkey to allow to show editor and previewer panels side by side on MathExchange (maybe other Exchanges as well).
After I reset Firefox I lost it and have been trying to search it for longer than two hours and I can't find it. I found a few posts on SE meta on the topic "preview on the right" but those posts are pretty old and are not actually pointing to a solution I was looking for.
Could someone please let me know where I can get it? Thanks.
aligned
and noalign
(2) one cannot do equation hyperlink via\tag
and\ref
(3) one cannot use\require
to load packages or\newcommand
to define macros..... The list goes on. $\endgroup$ – Lee David Chung Lin Apr 8 '19 at 3:52