As developers don't respond by  cryptowat.ch/support , I write here.
1) Settings window does not fit my monitor which height = 768 px.
2) Make pop-up menus (e.g. Overlays, Indicators, Hotkeys, etc.) to appear only after the mouse left click, not  the mouseover event, as it causes many false hits.

cryptowat.ch does not work on
- Mozilla Firefox  ESR 38.5.0 [sourceforge.net/projects/portableapps/files/Mozilla%20Firefox%2C%20Portable%20Ed./],
- Tor browser 5.0.7 [ archive.torproject.org/tor-package-archive/torbrowser/5.0.7/torbrowser-install-5.0.7_en-US.exe ],
- Opera 12.18 [opera-usb.com/download/operausb1218en.zip],
- last Otter browser [netcologne.dl.sourceforge.net/project/otter-browser/otter-browser-weekly208/otter-browser-win32-weekly208-xp.zip].

Can't install newer browser due to computer power.

How to erase a drawn line ? Reload the page does not help.

Found: right mouse button.

How to turn off annoying snow ?
https://s.sender.mobi/u/image/2017/12/22/z9rIscZO5/-.JPG

Found : If you're a total Grinch, you can disable it in the overlays menu. https://i.imgur.com/0FI2Xlr.png

What are the red and blue curves?
https://s.sender.mobi/u/image/2017/12/12/q8BMB8dVN/-.JPG