my browser seems incompatible with the new listal

my response to your question my browser it's a firefox
my main problems
1- if a page is too long to open i get stucked and i have to dropped out from the site
2- if i open more then one windows the add note button of my first window get stucked and i can't close it and i have to dropped out from the site to restart.
3- i get stucked frequently (9/10) when i changed page and i have to dropped out from the site everytime

i'm discouraged Tom i couldn't do anything in the past 3 days.

Can you post examples pages which are particularly bad and pages which work fine?

Each time that i tried to opened a second window while i was working on one of my new list my first page (the one with my new list) is automatically disable and i can't add some pics or write something but the image is not frozen or bad.

on my older list i've notice that some pics becamed bigger after the launch but i didn't find any pages with some bad images yet.

i've notice also if i'm on another site and i open a second window for this site my 2 pages becomes disable and i have to close everything.