To disable the Flash sandbox take the following steps:
- Type about:config in to the address bar and press enter:
- Click I accept the risk!
- Search for dom.ipc.plugins.sandbox-level.flash in the search bar:
- Double click on dom.ipc.plugins.sandbox-level.flash and change the integer value to 0:
- Right click on the Firefox icon and quit the browser:
- Re-open Firefox and log in to FlexiTime. You should now be able to download files as normal.