To display PDFs in Read Mode, do the followings:
a. Open Foxit PDF Editor or Foxit PDF Reader,
b. Choose File menu >Preferences>Documents.
c. Check the option “In Web Browser, Display PDF in Read Mode by default”,click on "OK" to save the setting.
Note:Firefox,Google Chrome and Opera these browsers all no longer support the NPAPI style plugins,so Foxit PDF plug-in can not work in Firefox(version 52 and above),Google Chrome(version 45 and above) and Opera(version 12.17 and above) anymore.