Please update to the most recent version of Firefox, the lastest version is 40.0.3: *[[Update Firefox to the latest version]] Second, this used to happen in the timesheet site for the company I work for. I would have to refresh the page if it started to become blank when I entered data. It would be there but would not appear when clicking to another field to edit. Another way I used to fix it was to clear the cache of the site. However I could never figure out if it was compatibility or something in the cache, I assumed the former until they fixed the site. Please also make sure that your extensions are up to date: *[https://www.mozilla.org/en-US/plugincheck/] If you see any issues also see: *[[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems]]