[3.3.191120-rc1] Integration Tests by [allfory0u] for Firefox

My OS:
- Windows 10

My Browser:
- Firefox 70.0.1 (64-bit)

General
- [x] Wallet loads and connects
- [x] Login via cloud login and local wallet
- [x] Transfer between accounts (with and without memo)
- [x] Exchange opens, orders are visible and limit orders can be put
- [x] Margin creation and adjustment is possible
- [x] Voting is possible (committee, witness, proposals)

Specific components:
- Spontaneous URL change after node change #2878 - failed - see #3101
- Portfolio - white screen when all assets are hidden #2887 - failed - see #3166

No source files or test entry points are named. Review the failures referenced in #3101 and #3166 first, then rerun the Firefox integration checklist; done means the reported URL-change and hidden-assets cases no longer fail.

Written by the indexing model from the issue text.