Not sure if this is a known issue or not. I just noticed when the text comparison tab is open all other tab scrolling slows way down to non-existent. Scrolling for the text comparison is fine. When I close text comparison all scrolling for all other tabs returns to normal.
Also, I know there is a shortcut key for a text comparison popup on the desktop version (I think F7). Is there one on the web app or mobile app?