When I am in Firefox, the forms open in a read-only format or try to open in Adobe Reader
If the forms try to open in Adobe Reader, and you get the "Stop. Click Cancel..." error check the following:
1. In Firefox, go to the button with 3 lines and click on the Options icon (it looks like a gear. Click on Applications.
2. For Portable Document Format make sure the selection under Actions is set to Use Adobe Acrobat (in Firefox).
3. Do the same for the 3 Adobe Acrobat selections.
4. If the forms still try to open in Adobe Reader, do the fix in Adobe Reader: