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Add-ons don't show up in the "Add-ons Manager" despite being installed...?

Posted

Opening the "Add-ons Manager" shows a message "You don't have any add-ons of this type installed" despite the fact I have many add-ons installed. In fact, I can still use add-ons just fine, they just don't show up in the manager. So, I can't access preferences for most of my add-ons.

I had this problem once before and was able to solve it through extensive Google searching. However, when I fixed the problem before, I had to re-add all of my add-ons to the browser window as it was reset to the default in fixing it. My issue isn't so much how to fix it like I did before, but rather—since it seems to have been only a temporary fix—figure out how to prevent it from happening again. See, I really don't want to have to do what I did before as it is time consuming. Especially, if it's going to happen again. Like, I don't want to have to reset and re-organize Firefox every couple of months.

The solution I used before, if I recall correctly, was deleting some preference files, re-opening Firefox, and then putting everything back the way it was. Restarting Firefox in safe mode did nothing and restarting my computer did nothing. I can't remember if I updated Firefox after noticing the problem the first time; I don't think I did, so I'm not sure if it would've fixed the problem or not (or if updating caused it because I had recently updated Firefox prior to noticing the problem).

One more piece of info is that the first time this happened to me was Firefox 14 or 14.1 (or .0.1 maybe).

Additional System Details

This happened

Just once or twice

This started when...

Not sure; might be related to updates, but I don't know.

Installed Plug-ins

  • Shockwave Flash 11.5 r502
  • Version 3.10.2.10212
  • Google Talk Plugin Video Accelerator version:0.1.44.23
  • Displays Java applet content, or a placeholder if Java is not installed.
  • The Flip4Mac WMV Plugin allows you to view Windows Media content using QuickTime.
  • Facebook Video Calling by Skype
  • Progressive Downloader Integration Plug-in
  • The Google Earth Plugin allows you to view 3D imagery and terrain in your web browser.
  • The QuickTime Plugin allows you to view a wide variety of multimedia content in web pages. For more information, visit the QuickTime Web site.
  • Picasa plugin.
  • iPhoto6

Application

  • User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:16.0) Gecko/20100101 Firefox/16.0

More Information

Application Basics
Name
Firefox
Version
16.0.2
User Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:16.0) Gecko/20100101 Firefox/16.0
Profile Folder
Show in Finder
Enabled Plugins
about:plugins
Build Configuration
about:buildconfig
Crash Reports
about:crashes
Memory Use
about:memory
Extensions
Name
Version
Enabled
ID
Important Modified Preferences
Name
Value
accessibility.typeaheadfind
true
accessibility.typeaheadfind.flashBar
0
browser.cache.disk.capacity
1048576
browser.cache.disk.smart_size.first_run
false
browser.cache.disk.smart_size_cached_value
450560
browser.history_expire_days.mirror
180
browser.places.importBookmarksHTML
false
browser.places.smartBookmarksVersion
4
browser.search.useDBForOrder
true
browser.startup.homepage
chrome://speeddial/content/speeddial.xul
browser.startup.homepage_override.buildID
20121024073032
browser.startup.homepage_override.mstone
16.0.2
browser.tabs.animate
false
browser.tabs.closeWindowWithLastTab
false
dom.ipc.plugins.enabled.i386.coolirisembedded.bundle
false
dom.ipc.plugins.enabled.x86_64.coolirisembedded.bundle
false
extensions.checkCompatibility
false
extensions.checkCompatibility.3.6
false
extensions.checkCompatibility.3.6b
false
extensions.checkCompatibility.3.6p
false
extensions.checkCompatibility.3.6pre
false
extensions.checkCompatibility.3.7a
false
extensions.checkCompatibility.4.0b
false
extensions.checkCompatibility.4.0p
false
extensions.checkCompatibility.4.0pre
false
extensions.checkCompatibility.4.2
false
extensions.checkCompatibility.4.2a
false
extensions.checkCompatibility.4.2b
false
extensions.checkCompatibility.4.2p
false
extensions.checkCompatibility.4.2pre
false
extensions.checkCompatibility.5.0a
false
extensions.checkCompatibility.5.0b
false
extensions.checkCompatibility.5.0p
false
extensions.checkCompatibility.5.0pre
false
extensions.lastAppVersion
16.0.2
network.cookie.prefsMigrated
true
places.database.lastMaintenance
1352519264
places.history.expiration.transient_current_max_pages
71027
places.history.expiration.transient_optimal_database_size
57488588
places.last_vacuum
1298768443
plugin.disable_full_page_plugin_for_types
print.macosx.pagesetup-2
PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iVVRGLTgiPz4KPCFET0NUWVBFIHBsaXN0IFBVQkxJQyAiLS8vQXBwbGUvL0RURCBQTElTVCAxLjAvL0VO…
print.print_bgcolor
false
print.print_bgimages
false
print.print_command
print.print_downloadfonts
false
print.print_evenpages
true
print.print_in_color
true
print.print_margin_bottom
0.5
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_pagedelay
500
print.print_paper_data
0
print.print_paper_height
11.00
print.print_paper_size_type
1
print.print_paper_size_unit
0
print.print_paper_width
8.50
print.print_printer
print.print_reversed
false
print.print_scaling
1.00
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.cpd.cache
false
privacy.cpd.extensions-tabmix
false
privacy.cpd.sessions
false
privacy.donottrackheader.enabled
true
privacy.popups.showBrowserMessage
false
privacy.sanitize.migrateFx3Prefs
true
security.warn_viewing_mixed
false
Graphics
Vendor ID
0x10de
Device ID
0x 8a0
WebGL Renderer
NVIDIA Corporation -- NVIDIA GeForce 320M OpenGL Engine -- 2.1 NVIDIA-1.6.36
GPU Accelerated Windows
1/1 OpenGL
AzureBackend
quartz
JavaScript
Incremental GC
1
Accessibility
Activated
0
Prevent Accessibility
0
Library Versions
Expected minimum version
Version in use
NSPR
4.9.2
4.9.2
NSS
3.13.6.0 Basic ECC
3.13.6.0 Basic ECC
NSS Util
3.13.6.0
3.13.6.0
NSS SSL
3.13.6.0 Basic ECC
3.13.6.0 Basic ECC
NSS S/MIME
3.13.6.0 Basic ECC
3.13.6.0 Basic ECC

iamjayakumars
  • Top 10 Contributor
415 solutions 4924 answers

Add-ons Manager click the Extension to See your Installed Addons.

How you installed firefox Add-ons Directly from the firefox addon website or installed as a file from local disk.

Question owner

I installed them from the Firefox add-on website. The problem is when I click Add-ons Manager > Extensions, I get "You don't have any add-ons of this type installed" despite having a bunch installed and usable.

Modified by DNLFerguson

cor-el
  • Top 10 Contributor
  • Moderator
10749 solutions 96732 answers

Helpful Reply

It is possible that there is a problem with the file(s) that store the extensions registry.

Delete the files extensions.* (e.g. extensions.sqlite, extensions.ini, extensions.cache) and compatibility.ini in the Firefox profile folder to reset the extensions registry.

New files will be created when required.

See "Corrupt extension files":

If you see disabled, not compatible, extensions in "Tools > Add-ons > Extensions" then click the Tools button at the left side of the Search Bar (or click the "Find Updates" button in older Firefox versions) to check if there is a compatibility update available.

If this hasn't helped then also try to delete the addons.sqlite file.

Question owner

Right, I've done that before to fix the problem but fixing it reset the icons on my browser window to the default. Plus (and I actually just remembered this), I had to reinstall every single one of my add-ons after deleting those files last time. I guess what I'm wondering is—since this has happened multiple times—if there is a way to fix it without having to reorganize and reinstall everything again?

PeterMeterReader 0 solutions 1 answers

Helpful Reply

I had this exact problem a couple of days ago. The workaround was rather easy:

Just go to the add-ons-manager and install some random add-on from addons.mozilla.org. Once you restart Firefox, all the add-ons are back in the add-ons-manager, but they are disabled. Just enable them all, and you're back to normal.

All the settings, icons, etc., of the different add-ons are still there.

margretdzn 0 solutions 13 answers

Tried that, still doesn't come up---got the new add-on I just installed, but the add on page is still blank?

margretdzn 0 solutions 13 answers

Holy Cow! I was just playing around on the add-ons page that wouldn't come up----I might there are two buttons, "my add-ons" and "available add-ons"----neither of them work Soooooo, I typed "my add-ons" in the SEARCH box, and all my add-ons came up as they were supposed to!

Gosh, FF, you're driving me nuts!

margretdzn 0 solutions 13 answers

Rut-Roh------Further, I just installed another add on and now when I go to "my add-ons", ONLY THIS NEW ADD ON SHOWS UP, none of the others??????

Gosh......