After having tested on both Chrome and Firefox, I noticed a couple interesting things. Hope this helps anyone troubleshooting. A sheet created in Firefox does not give the option "How do you want to create this Character? Use the Charactermancer, Create an NPC, Edit the Sheet directly" Instead, it drops you directly onto the PC sheet. If you switch to chrome and look at that same sheet created in Firefox, you then have the option of "How do you want to create this Character?". Additionally, if I create a sheet in Firefox, close it, open the sheet in Chrome, close it, and then open it in Firefox again, I get the "How do you want to create this Character?" options, but I can't click on anything. This locks the sheet until it is opened in Chrome and an option selected. The Attributes tab is not being updated/populated properly when using Firefox. When I create a new sheet, there are just 4 attributes. Thats it. Additionally, when I make changes to a sheet, it updates the specific value you are editing, but it does not update dependent values. For instance, I update the Strength score of a sheet, and it updates the attribute "strength_base", but it does not update "strength", "strength_mod", "strength_save_bonus", etc. I can add those attributes and assign their values manually, and the sheet then works. This applies to newly created sheets as well as pre-existing ones.