This sandbox site is the basis for our live demo. For your own projects, you can use apostrophe-boilerplate as a more streamlined, cleaner point of departure via the apostrophe-cli tool.
We've made a lot of firefox improvements to the standard editor, and the new apostrophe-editor-2 module is fundamentally less cross-platform-wonky because it doesn't try to jam widgets into a text editor.
Here is a collection of bugs, and or Problems with the sandbox using firefox