Imac- browsers can't seem to surf web after a short period of time

I have a client with an Imac- 10.10. I recently installed Apple Airport Extremes for improved wifi, removing a Netgear router. All other devices in the home have no issues. However on the Imac, browsers (used Safari AND Firefox) will work for a short period and then will not surf and leave the spinning wheel until it times out or just sits there and I have to force quit. This happens with wifi AND Ethernet connection. If you reboot the Imac, everything works again for a short period and then stops. I can ping anywhere without a problem. I have reset defaults on the browsers and still the same issue. I ran Malwarebytes and found the "seach protect" crapware on the system and removed it. However, still the same issue. I have also put the original Netgear router back in to see if possibly a compatibility problem of some sort, and it happens with the Netgear as well now.

Suggestions?

Thank you,
TF
tfariss70Asked:
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strungCommented:
Safari>Preferences>Extensions - disable any extensions
Safari>Preferences>Security - uncheck Allow Plugins

Reboot Safari.

If that solves your problem you can go back and try to figure out which particular plugin or extension is causing the problem.

Alternatively, when you get the spinning wheel, open Console.app (found in /Applications/Utilities) and see what error messages are being spawned and copy and paste them back here.
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tfariss70Author Commented:
I have already done full resets of both browsers. I have now even run the OS restore to repair the OS. I still have the same problem. I also cannot get into the diag screen at boot up...
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strungCommented:
None of those things will necessarily delete the plug ins or extensions.

Please try disabling them as per my previous post and if the problem persists, post an excerpt from the console logs as suggested.
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tfariss70Author Commented:
Ok, well after doing all that, it looks like it points to hardware, however my client has decided to look into a new Mac, since this one is 6 years old now. Thank you Strung for your assistance, I appreciate you taking the time to try to assist me.
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serialbandCommented:
If you reboot the Imac, everything works again for a short period and then stops. I can ping anywhere without a problem.
Do you mean that you can ping even when the browsers stop working?  Have you tried reseting the SMC and PRAM?  Those may sometimes help with Mac weirdness.
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tfariss70Author Commented:
Due to client decision, it was no longer necessary to troubleshoot this issue.
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