Microsoft Windows 10 will ship with two browsers: Internet Explorer 11 and the new Edge browser.
The Edge browser will be the default browser, and Internet Explorer 11 will be available to support legacy workflows. The new Edge browser will not have any support for ActiveX plug-ins. Therefore, the Acrobat/Reader plug-in won't work with Edge. For more information, see Change in support for Acrobat and Reader plug-ins in modern web browsers.
Use Internet Explorer 11 to open PDFs. To enable the Acrobat/Reader plug-in in Internet Explorer, see the steps in the previous section.
Mozilla Firefox
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In the Add-ons Manager window, click the Plugins tab, then select Adobe Acrobat or Adobe Reader.
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Choose an appropriate option in the drop-down list next to the name of the plug-in.
Always Activate sets the plug-in to open PDFs in the browser.
Ask to Activate prompts you to turn on the plug-in while opening PDFs in the browser.
Never Activate turns off the plug-in so it does not open PDFs in the browser.

Select the Acrobat or Reader plugin in the Add-ons Manager.
Google Chrome
Chrome and Acrobat are no longer compatible. The Acrobat/Reader plug-in for Google Chrome is based on the Netscape Plug-In API (NPAPI) technology. Google announced that in April 2015 NPAPI plug-in support would be disabled by default in the Google Chrome web browser, with an override capability for advanced users. In September 2015, NPAPI support in the Google Chrome web browser was removed entirely.
For more information, see Change in support for Acrobat and Reader plug-ins in modern web browsers.
Apple Safari
To view PDFs with Safari, you can do one of the following:
- Set Safari preferences to use Adobe Reader plug-in
- Disable AdobePDFViewer plug-in to use the default Safari PDF viewer
Set Safari preferences to use Adobe Reader plug-in to view PDFs
Launch Safari, and then choose Preferences.
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In the Preferences window, choose Security and then click the Website Settings button for Internet plug-ins.
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Now select Adobe Reader in the list of plug-ins.
Under the option When visiting other Websites, in the drop-down list, choose Allow Always and then click Done.

Note:
This will set the browser to use the Adobe Reader plug-in to view PDFs.
Disable AdobePDFViewer plug-in to use the default Safari PDF viewer
You must have root user privileges to change Safari plug-ins. To display PDFs using the Safari PDF viewer, you must disable the Adobe PDF Viewer.
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Choose Go > Go To Folder.
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Type /Library in the Go to the Folder field, and click Go.
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Create a new folder in the Library folder, and name it Internet Plug-ins Disabled.
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Open the Internet Plug-ins folder, and move both the AdobePDFViewer.plugin and the AdobePDFViewerNPAPI.plugin into the new Internet Plug-ins Disabled folder.

Note:
If both AdobePDFViewer plug-ins are still in the Internet Plug-ins folder, drag them now to the trash. You may be asked for your name and password.
For more information on disabling or removing plug-ins, see Apple Safari help.