Firefox running under Linux Mint (based on Ubuntu) 12 (KDE) won't install extensions for Firefox

Linux Mint (based on Ubuntu) 12, KDE desktop
Firefox 10.0
Started up Firefox right after Mint was installed. On the add-ons page video download helper was shown as a featured extension and I installed it, then rebooted when prompted. After that, Firefox would never install another extension again. Just gives download error.
I google searched and in a forum I found a post about uninstalling and reinstalling Firefox. I tried it. First time I started it up, it installed video download helper again, but then would not install any other extension after that. I tried numerous extensions I '''KNOW''' are working in Firefox 10.0 because they are working in Firefox over on my Win 7. Everytime I get a download error, either from the addons site or from the Add-ons Manager in Firefox.
Someone told me on the Mint forums that I needed to add a subdirectory on a certain directory, so I did that. Didn't work.
It seems Ubuntu disables the root, or cripples it, and I guess Mint does too. You can still use sudo when doing things in Ubuntu (and Mint I would assume, since it's based on Ubuntu) but you can't get true 'superuser' access as I understand it. But, I don't think this would have any bearing on the problem, or my search of the Mint forums would have come up with all kinds of threads screaming about this.

Problem solved - it was caused by an add-on called "PDF Download 3.0.0.2)
To fix - in Firefox :
Click on '''Tools''' command (top of screen)
Select '''Extensions'''
click on "'''disable''' button beside '''PDF Download'''
Close Firefox and restart it.
Clicking on any pdf file should open a new tab now and the document will appear there.

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Version: 30.0
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Crash Reports for the Last 3 Days
Report ID: bp-026e0f21-ce63-4999-a519-4144a2140728
Submitted: 1 hour ago
Report ID: bp-62670bdb-4739-48cd-ac0c-f21dc2140728
Submitted: 1 hour ago
Report ID: bp-93922bab-02af-46dd-9bc8-7fea22140728
Submitted: 3 hours ago
Report ID: bp-0085d56a-88c2-4882-886d-4e4c92140728
Submitted: 4 hours ago
Report ID: bp-59d7b141-61f3-420a-8932-98eef2140725
Submitted: 3 days ago
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ID: {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}
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ID: [email protected]
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font.name.serif.x-western: sans-serif
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places.history.expiration.transient_current_max_pages: 101401
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plugin.state.npflareget: 0
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print.print_colorspace: default
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print.print_margin_left: 0.5
print.print_margin_right: 0.5
print.print_margin_top: 0.5
print.print_oddpages: true
print.print_orientation: 0
print.print_page_delay: 50
print.print_paper_data: 0
print.print_paper_height: 279.40
print.print_paper_name: na_letter
print.print_paper_size_type: 1
print.print_paper_size_unit: 1
print.print_paper_width: 215.90
print.print_plex_name: default
print.print_resolution_name: default
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print.print_shrink_to_fit: true
print.print_to_file: false
print.print_unwriteable_margin_bottom: 56
print.print_unwriteable_margin_left: 25
print.print_unwriteable_margin_right: 25
print.print_unwriteable_margin_top: 25
privacy.sanitize.migrateFx3Prefs: true
storage.vacuum.last.index: 1
storage.vacuum.last.places.sqlite: 1406028661
Graphics
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Device ID: Mesa DRI Intel(R) Sandybridge Mobile
Driver Version: 3.0 Mesa 9.0.3
GPU Accelerated Windows: 0/1 Basic
Vendor ID: Intel Open Source Technology Center
WebGL Renderer: Intel Open Source Technology Center -- Mesa DRI Intel(R) Sandybridge Mobile
windowLayerManagerRemote: false
AzureCanvasBackend: cairo
AzureContentBackend: cairo
AzureFallbackCanvasBackend: none
AzureSkiaAccelerated: 0
JavaScript
Incremental GC: true
Accessibility
Activated: false
Prevent Accessibility: 0
Library Versions
NSPR
Expected minimum version: 4.10.6
Version in use: 4.10.6
NSS
Expected minimum version: 3.16 Basic ECC
Version in use: 3.16 Basic ECC
NSSSMIME
Expected minimum version: 3.16 Basic ECC
Version in use: 3.16 Basic ECC
NSSSSL
Expected minimum version: 3.16 Basic ECC
Version in use: 3.16 Basic ECC
NSSUTIL
Expected minimum version: 3.16
Version in use: 3.16

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