Version 115 is MUCH better at detecting when a page can use Reader View and turning on the Reader View icon. With previous releases I often had to refresh the page to get the Reader View icon.Thank you!
Reddit user LunarAffinity has determined that the problem is only with PDFs that have the 'Tagged PDF' attribute TRUE.See: https://www.reddit.com/r/Outlook/comments/1jnxjcc/outlook_web_pdf_preview_behaves_differently_in/
This appears to still be an issue. I am using the latest Firefox with all extensions disabled. I logon to my Outlook email account at outlook.com. I open an email with a PDF attachment. When I click on the attachment it opens in a new window. I can v...