Firefox will state that it is not responding

I use Kinnser web page to do my nursing notes on line, but when I am changing from page either back or going forward within the Kinnser page, at upper left on my lap top it will state Firefox not responding for about 10-14 seconds then it will change to the page that I want. Thanks

'''https://support.mozilla.org/en-US/kb/firefox-slow-how-make-it-faster'''
'''https://support.mozilla.org/en-US/kb/firefox-uses-too-many-cpu-resources-how-fix'''
'''https://support.mozilla.org/en-US/kb/firefox-hangs-or-not-responding'''
Separate Issue;
Your System Details shows;
Installed Plug-ins
Adobe Shockwave for Director Netscape plug-in, version 11.5.9.620
Adobe Shockwave for Director Netscape plug-in, version 11.6.8.638
Having more than one version of a program may cause issues.
Grab the uninstaller from here:
'''[http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html Uninstall Flash Player | Windows]'''
'''[http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-mac-os.html Uninstall Flash Player | Mac]'''
Then reinstall the latest version.
Flash Player '''Version 16.0.0.305<br>https://www.adobe.com/products/flashplayer/distribution3.html'''
Shockwave Director '''Version 12.1.7.157 http://get.adobe.com/shockwave/'''

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