How come absolutely none of my add ons/extensions are working even when i try to redownload them?

it has been approximately four months since my add ons/extensions haven't been working and i just cannot figure out why. one day i opened firefox and each one of my add ons started to not work anymore [there was no update i might ad so lack of compatibility is out of the question also since most of my add ons are compatible with at least version 3.6] i'm running on windows vista 64bit premium home edition. yeah. please help me because this is really annoying and i cannot download any youtube videos nor music from any other website. thanks in advance
-EDL1

'''elitedarklord_1337'''
Delete the files extensions.* (extensions.rdf, extensions.cache, extensions.ini) and compatibility.ini in the Firefox [[Profiles|profile folder]] to reset the extensions registry.
See "Corrupt extension files": http://kb.mozillazine.org/Unable_to_install_themes_or_extensions
If you see disabled extensions that are not compatible on the next start in "Tools > Add-ons > Extensions" then click the "Find Updates" button to do a compatibility check.
'''amal123'''
See your own thread: [/questions/747509]

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Application Basics
Name: Firefox
Version: 33.0
User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:33.0) Gecko/20100101 Firefox/33.0
Multiprocess Windows: 0/1
Crash Reports for the Last 3 Days
All Crash Reports
Extensions
Name: Cinema ploos
Version: 0.95.5
Enabled: false
ID: [email protected]
Name: DivX Plus Web Player HTML5 <video>
Version: 2.1.2.145
Enabled: false
ID: {23fcfd51-4958-4f00-80a3-ae97e717ed8b}
Graphics
Device ID: 0x6740
GPU Accelerated Windows: 1/1 OpenGL (OMTC)
Vendor ID: 0x1002
WebGL Renderer: ATI Technologies Inc. -- ATI Radeon HD 6770M OpenGL Engine
windowLayerManagerRemote: true
AzureCanvasBackend: quartz
AzureContentBackend: quartz
AzureFallbackCanvasBackend: none
AzureSkiaAccelerated: 0
Important Modified Preferences
browser.cache.disk.capacity: 358400
browser.cache.disk.smart_size.first_run: false
browser.cache.disk.smart_size.use_old_max: false
browser.cache.frecency_experiment: 1
browser.places.smartBookmarksVersion: 7
browser.sessionstore.upgradeBackup.latestBuildID: 20141011015303
browser.startup.homepage: http://dvd.netflix.com/Queue?lnkctr=mhbque&qtype=DD
browser.startup.homepage_override.buildID: 20141011015303
browser.startup.homepage_override.mstone: 33.0
extensions.lastAppVersion: 33.0
gfx.blacklist.direct2d: 3
gfx.blacklist.layers.direct3d9: 3
media.gmp-gmpopenh264.lastUpdate: 1414115832
media.gmp-gmpopenh264.version: 1.1
media.gmp-manager.lastCheck: 1414115827
network.cookie.prefsMigrated: true
places.database.lastMaintenance: 1414111485
places.history.expiration.transient_current_max_pages: 104858
plugin.disable_full_page_plugin_for_types: application/pdf
plugin.importedState: true
privacy.donottrackheader.enabled: true
privacy.sanitize.migrateFx3Prefs: true
storage.vacuum.last.index: 0
storage.vacuum.last.places.sqlite: 1414111483
Important Locked Preferences
JavaScript
Incremental GC: true
Accessibility
Activated: false
Prevent Accessibility: 0
Library Versions
NSPR
Expected minimum version: 4.10.7
Version in use: 4.10.7
NSS
Expected minimum version: 3.17.1 Basic ECC
Version in use: 3.17.1 Basic ECC
NSSSMIME
Expected minimum version: 3.17.1 Basic ECC
Version in use: 3.17.1 Basic ECC
NSSSSL
Expected minimum version: 3.17.1 Basic ECC
Version in use: 3.17.1 Basic ECC
NSSUTIL
Expected minimum version: 3.17.1
Version in use: 3.17.1
Experimental Features
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How come absolutely none of my add ons/extensions are working even when i try to redownload them?

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