When I try to install "Addblock Plus", a pop-up box displays "Add-on downloading", and "unknown time remaining - 0 bytes (0 bytes / sec)". My local area connection status box shows that it is connected but that nothing is being received.

I am using Firefos 9.0.1 under Windows XP. I use Avast anti-virus. My Add-ons bar is empty. I have not initiated the installation of any plug-ins. Downloads keeps no record of my attempts.

Thank you for your interest mha007. This is an update on my evenings activities so far.
I have done that trouble shooting with results, as follows:
Started in safe mode
In Tools/Options/Advanced/General, I unchecked "Use hardware acceleration when available"
Clicked on Tools/Add-ons
"Get add-ons" displayed "Loading" indefinitely
All 5 Extensions are dis-abled: it suggested that I remove "Microsoft.net framework assistant 1.2.1" & "Test pilot 1.2".
On "Microsoft.net framework assistant 1.2.1" I Clicked "Remove". It remained but with version 0.0.0.
On "Test pilot 1.2" I clicked "Remove". It disappeared.
The single Appearance "Default 9.0.1" is disabled
None of the 16 plug-ins are disabled.
I clicked on Add-ons and "Get add-ons" displayed "Loading"
Several minutes later I found that, "Add-ons" had loaded.
I clicked on "Most popular" and then on "Add to Firefox " within "Adblock plus"
A pop-up box displayed "Add-on downloading", and "unknown time remaining - 0 bytes (0 bytes / sec)".
Within a minute, a Firefox "Alert" pop-up window opened with the message: "An error occurred during a connection to www.mozilla.org:443 / The OCSP server experienced an internal error. / (Error code: sec_error_ocsp_server_error)"
I bookmarked the "Most popular add-ons page"
I closed Firefox and opened it again - not in safe mode.
Clicked on Tools/Add-ons. "Get add-ons" displayed "Loading".
In Extensions, on "Microsoft.net framework assistant 1.2.1" I Clicked Disable", and Restart Firefox
I clicked on Tools/Add-ons. "Get add-ons" displayed "Loading". Message displayed "Connected to services.add-ons.mozilla.org. Waited.
10 minutes later I opened a new tab and clicked on the "Most popular add-ons page" bookmark. Message displayed "Connected to add-ons.mozilla.org". Waited.
15 minutes later, neither of the tabs had responded. I re-started firefox in safe mode
I clicked on Tools/Add-ons. "Get add-ons" displayed "Loading". Message displayed "Connected to static-ssl-cdn.addons.mozill.net"
Using the new tab from above which was not active on restart, I clicked on the "Most popular add-ons page" bookmark.
The bookmarked page opened. I clicked on "Add to Firefox " within "Adblock plus"
Again, a pop-up box displayed "Add-on downloading", and "unknown time remaining - 0 bytes (0 bytes / sec)". (No Alert this time).
I don't know what to read into all of this. Any advice on what the next best thing to do would be appreciated.

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