The only "battle" is whether the Adobe PDF plugin can be used in a browser. Adobe decided not to follow the strict restrictions most browser creators (Apple, Google, Mozilla, Microsoft) enforce on plugin developers, so their plugin doesn't work under those browsers any longer. Instead, PDF files are opened with the internal plugins, which are all pretty bad, but that's beyond Adobe's control.
Personally I think it's a huge mistake that undermines the global usability of the PDF format in the long run and Adobe should do its best to meet those conditions and get its browser plugin working once again.
I think your mistake is using a browser to view PDF files instead of Acrobat software. You're at mercy of whichever feeble PDF viewer your browser wants you to use.
The major browsers announced years ago the end of support for 3rd party plugins. NPAPI plugins are an obsolete technology, so browsers have moved away from them for security reasons.
Flash Player was the most recent casualty and before that it was QuickTime, Java, Silverlight, Shockwave and others that we no longer need. With that in mind, always open PDF files directly in Acrobat. You can associate PDF files with Acrobat through your operating system's file manager (Win File Explorer or Mac Finder).
Hope that helps.
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Nancy O'Shea, Adobe Product User & Community Professional Alt-Web Design & Publishing ~ Web : Print : Graphics : Media