X
Tap here to go to the mobile version of the site.

Support Forum

For no apparent reason the add-on toolbar disappeared. After opening view/toolbars and customize the add-on toolbar immediately appears . However, once I click-on "Done"; the toolbar again disappears. Please advise possible solution.

Posted

Windows 7 O.S. and latest version of FF browser.

Windows 7 O.S. and latest version of FF browser.

Modified by 10pinfvr

Chosen solution

Start Firefox in Troubleshoot Firefox issues using Safe Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).

Read this answer in context 0

Additional System Details

Installed Plug-ins

  • Office Plugin for Netscape Navigator
  • np-mswmp
  • Default Plug-in
  • NPRuntime Script Plug-in Library for Java(TM) Deploy
  • Adobe PDF Plug-In For Firefox and Netscape 10.1.0
  • BrowserPlus -- Improve your browser! -- http://browserplus.yahoo.com/
  • Shockwave Flash 10.3 r181
  • GEPlugin
  • Next Generation Java Plug-in 1.6.0_26 for Mozilla browsers
  • 4.0.60531.0
  • Google Update

Application

  • User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0.1) Gecko/20100101 Firefox/5.0.1

More Information

Application Basics
Name
Firefox
Version
5.0.1
User Agent
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0.1) Gecko/20100101 Firefox/5.0.1
Profile Directory
Open Containing Folder
Enabled Plugins
about:plugins
Build Configuration
about:buildconfig
Extensions
Name
Version
Enabled
ID
Adblock Plus
1.3.9
true
{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}
Add-on Compatibility Reporter
0.8.6
true
compatibility@addons.mozilla.org
AddThis
3.1.1
true
{3e0e7d2a-070f-4a47-b019-91fe5385ba79}
avast! WebRep
6.0.1203
true
wrc@avast.com
Cooliris
1.12.3.47088
true
piclens@cooliris.com
CoolPreviews
3.3
true
{CE6E6E3B-84DD-4cac-9F63-8D2AE4F30A4B}
Download Statusbar
0.9.8
true
{D4DD63FA-01E4-46a7-B6B1-EDAB7D6AD389}
DownloadHelper
4.9.3
true
{b9db16a4-6edc-47ec-a1f4-b86292ed211d}
Element Hiding Helper for Adblock Plus
1.1.1
true
elemhidehelper@adblockplus.org
Flagfox
4.1.4
true
{1018e4d6-728f-4b20-ad56-37578a4de76b}
FoxTab
1.4.3
true
{ef4e370e-d9f0-4e00-b93e-a4f274cfdd5a}
Ghostery
2.5.3
true
firefox@ghostery.com
Google Translator for Firefox
1.5
true
translator@zoli.bod
ImTranslator
4.2
true
{9AA46F4F-4DC7-4c06-97AF-5035170634FE}
InvisibleHand
3.2.0
true
canitbecheaper@trafficbroker.co.uk
Java Console
6.0.19
true
{CAFEEFAC-0016-0000-0019-ABCDEFFEDCBA}
Java Console
6.0.20
true
{CAFEEFAC-0016-0000-0020-ABCDEFFEDCBA}
Java Console
6.0.21
true
{CAFEEFAC-0016-0000-0021-ABCDEFFEDCBA}
Java Console
6.0.22
true
{CAFEEFAC-0016-0000-0022-ABCDEFFEDCBA}
Java Console
6.0.23
true
{CAFEEFAC-0016-0000-0023-ABCDEFFEDCBA}
Java Console
6.0.26
true
{CAFEEFAC-0016-0000-0026-ABCDEFFEDCBA}
LightShot (screenshot tool)
2.0.1
true
{394DCBA4-1F92-4f8e-8EC9-8D2CB90CB69B}
Memory Restart
1.4
true
memoryrestart@teamextension.com
Microsoft .NET Framework Assistant
0.0.0
true
{20a82645-c095-46ed-80e3-08825760534b}
Norton Toolbar
2011.7.0.8
true
{2D3F3651-74B9-4795-BDEC-6DA2F431CB62}
PDF Download
3.0.0.2
true
{37E4D8EA-8BDA-4831-8EA1-89053939A250}
Personal Menu
5.0.5
true
CompactMenuCE@Merci.chao
PrivacyChoice TrackerBlock
2.0.1
true
trackerblock@privacychoice.org
Speed Dial
0.9.6.1
true
{64161300-e22b-11db-8314-0800200c9a66}
Status-4-Evar
2011.06.28.22
true
status4evar@caligonstudios.com
Symantec IPS
3.0
true
{BBDA0591-3099-440a-AA10-41764D9DB4DB}
The Camelizer
1.5
true
izer@camelcamelcamel.com
United States English Spellchecker
5.0.1
true
en-US@dictionaries.addons.mozilla.org
WindowShopper
1.2.0.12
true
superfish@superfish.com
Yahoo! Toolbar
2.3.8.20110620112826
true
{635abd67-4fe9-1b23-4f01-e679fa7484c1}
McAfee SiteAdvisor
3.3.1
false
{B7082FAA-CB62-4872-9106-E42DD88EDE45}
Modified Preferences
Name
Value
accessibility.blockautorefresh
true
browser.fixup.alternate.enabled
false
browser.history_expire_days.mirror
180
browser.places.smartBookmarksVersion
2
browser.startup.homepage
http://my.yahoo.com/
browser.startup.homepage_override.buildID
20110707182747
browser.startup.homepage_override.mstone
rv:5.0.1
browser.tabs.loadInBackground
false
dom.ipc.plugins.enabled.npcoolirisplugin.dll
false
extensions.checkCompatibility
false
extensions.checkCompatibility.3.6
false
extensions.checkCompatibility.3.6.previous
false
extensions.checkCompatibility.3.6b
false
extensions.checkCompatibility.3.6b.previous
false
extensions.checkCompatibility.3.6p
false
extensions.checkCompatibility.3.6p.previous
false
extensions.checkCompatibility.3.6pre
false
extensions.checkCompatibility.3.6pre.previous
false
extensions.checkCompatibility.3.7a
false
extensions.checkCompatibility.3.7a.previous
false
extensions.checkCompatibility.4.0
false
extensions.checkCompatibility.4.0.previous
false
extensions.checkCompatibility.4.0b
false
extensions.checkCompatibility.4.0b.previous
false
extensions.checkCompatibility.4.0p
false
extensions.checkCompatibility.4.0p.previous
false
extensions.checkCompatibility.4.0pre
false
extensions.checkCompatibility.4.0pre.previous
false
extensions.checkCompatibility.4.2
false
extensions.checkCompatibility.4.2.previous
false
extensions.checkCompatibility.4.2a
false
extensions.checkCompatibility.4.2a.previous
false
extensions.checkCompatibility.4.2b
false
extensions.checkCompatibility.4.2b.previous
false
extensions.checkCompatibility.4.2p
false
extensions.checkCompatibility.4.2p.previous
false
extensions.checkCompatibility.4.2pre
false
extensions.checkCompatibility.4.2pre.previous
false
extensions.checkCompatibility.5.0
false
extensions.checkCompatibility.5.0.previous
false
extensions.checkCompatibility.5.0a
false
extensions.checkCompatibility.5.0a.previous
false
extensions.checkCompatibility.5.0b
false
extensions.checkCompatibility.5.0b.previous
false
extensions.checkCompatibility.5.0p
false
extensions.checkCompatibility.5.0p.previous
false
extensions.checkCompatibility.5.0pre
false
extensions.checkCompatibility.5.0pre.previous
false
extensions.checkCompatibility.6.0
false
extensions.checkCompatibility.6.0.previous
false
extensions.checkCompatibility.6.0a
false
extensions.checkCompatibility.6.0a.previous
false
extensions.checkCompatibility.7.0
false
extensions.checkCompatibility.7.0.previous
false
extensions.checkCompatibility.7.0a
false
extensions.checkCompatibility.7.0a.previous
false
extensions.checkCompatibility.8.0
false
extensions.checkCompatibility.8.0.previous
false
extensions.checkCompatibility.8.0a
false
extensions.checkCompatibility.8.0a.previous
false
extensions.checkCompatibility.nightly
false
extensions.checkCompatibility.nightly.previous
false
extensions.checkCompatibility.previous
false
extensions.lastAppVersion
5.0.1
general.useragent.extra.btrs
BTRS86025
keyword.URL
http://search.addthis.com/search?pco=fxe-3.1.1&locale=en-US&sl=ub&q=
network.cookie.cookieBehavior
1
network.cookie.lifetimePolicy
2
network.cookie.prefsMigrated
true
network.http.max-connections
32
network.http.max-connections-per-server
8
network.http.max-persistent-connections-per-server
4
network.http.pipelining
true
network.http.pipelining.firstrequest
true
network.http.pipelining.maxrequests
8
network.http.proxy.pipelining
true
network.http.request.max-start-delay
0
places.database.lastMaintenance
1310576438
places.history.expiration.transient_current_max_pages
128687
places.last_vacuum
1299718513
print.print_printer
Brother MFC-5440CN USB Printer (Copy 1)
print.printer_Brother_MFC-5440CN_USB_Printer.print_bgcolor
false
print.printer_Brother_MFC-5440CN_USB_Printer.print_bgimages
false
print.printer_Brother_MFC-5440CN_USB_Printer.print_command
print.printer_Brother_MFC-5440CN_USB_Printer.print_downloadfonts
false
print.printer_Brother_MFC-5440CN_USB_Printer.print_edge_bottom
0
print.printer_Brother_MFC-5440CN_USB_Printer.print_edge_left
0
print.printer_Brother_MFC-5440CN_USB_Printer.print_edge_right
0
print.printer_Brother_MFC-5440CN_USB_Printer.print_edge_top
0
print.printer_Brother_MFC-5440CN_USB_Printer.print_evenpages
true
print.printer_Brother_MFC-5440CN_USB_Printer.print_footercenter
print.printer_Brother_MFC-5440CN_USB_Printer.print_footerleft
&PT
print.printer_Brother_MFC-5440CN_USB_Printer.print_footerright
&D
print.printer_Brother_MFC-5440CN_USB_Printer.print_headercenter
print.printer_Brother_MFC-5440CN_USB_Printer.print_headerleft
&T
print.printer_Brother_MFC-5440CN_USB_Printer.print_headerright
&U
print.printer_Brother_MFC-5440CN_USB_Printer.print_in_color
true
print.printer_Brother_MFC-5440CN_USB_Printer.print_margin_bottom
0.5
print.printer_Brother_MFC-5440CN_USB_Printer.print_margin_left
0.5
print.printer_Brother_MFC-5440CN_USB_Printer.print_margin_right
0.5
print.printer_Brother_MFC-5440CN_USB_Printer.print_margin_top
0.5
print.printer_Brother_MFC-5440CN_USB_Printer.print_oddpages
true
print.printer_Brother_MFC-5440CN_USB_Printer.print_orientation
0
print.printer_Brother_MFC-5440CN_USB_Printer.print_pagedelay
500
print.printer_Brother_MFC-5440CN_USB_Printer.print_paper_data
1
print.printer_Brother_MFC-5440CN_USB_Printer.print_paper_height
11.00
print.printer_Brother_MFC-5440CN_USB_Printer.print_paper_size_type
0
print.printer_Brother_MFC-5440CN_USB_Printer.print_paper_size_unit
0
print.printer_Brother_MFC-5440CN_USB_Printer.print_paper_width
8.50
print.printer_Brother_MFC-5440CN_USB_Printer.print_reversed
false
print.printer_Brother_MFC-5440CN_USB_Printer.print_scaling
1.00
print.printer_Brother_MFC-5440CN_USB_Printer.print_shrink_to_fit
true
print.printer_Brother_MFC-5440CN_USB_Printer.print_to_file
false
print.printer_Brother_MFC-5440CN_USB_Printer.print_unwriteable_margin_bottom
0
print.printer_Brother_MFC-5440CN_USB_Printer.print_unwriteable_margin_left
0
print.printer_Brother_MFC-5440CN_USB_Printer.print_unwriteable_margin_right
0
print.printer_Brother_MFC-5440CN_USB_Printer.print_unwriteable_margin_top
0
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_bgcolor
true
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_bgimages
true
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_command
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_downloadfonts
false
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_edge_bottom
0
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_edge_left
0
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_edge_right
0
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_edge_top
0
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_evenpages
true
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_footercenter
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_footerleft
&PT
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_footerright
&D
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_headercenter
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_headerleft
&T
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_headerright
&U
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_in_color
true
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_margin_bottom
0.5
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_margin_left
0.5
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_margin_right
0.5
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_margin_top
0.5
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_oddpages
true
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_orientation
1
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_page_delay
50
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_pagedelay
500
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_paper_data
1
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_paper_height
11.00
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_paper_size_type
0
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_paper_size_unit
0
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_paper_width
8.50
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_reversed
false
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_scaling
1.00
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_shrink_to_fit
false
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_to_file
false
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_unwriteable_margin_bottom
0
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_unwriteable_margin_left
0
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_unwriteable_margin_right
0
print.printer_Brother_MFC-5440CN_USB_Printer_(Copy_1).print_unwriteable_margin_top
0
privacy.cpd.cookies
false
privacy.cpd.downloads
false
privacy.cpd.formdata
false
privacy.cpd.history
false
privacy.cpd.sessions
false
privacy.donottrackheader.enabled
true
privacy.popups.showBrowserMessage
false
privacy.sanitize.migrateFx3Prefs
true
privacy.sanitize.timeSpan
0
security.OCSP.disable_button.managecrl
false
security.disable_button.openCertManager
false
security.disable_button.openDeviceManager
false
security.enable_ssl2
true
security.enable_tls
false
security.warn_viewing_mixed
false
Graphics
Adapter Description
NVIDIA GeForce 9600M GS
Vendor ID
10de
Device ID
0648
Adapter RAM
512
Adapter Drivers
nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um
Driver Version
8.17.12.7061
Driver Date
4-7-2011
Direct2D Enabled
true
DirectWrite Enabled
true (6.1.7601.17563, font cache n/a)
WebGL Renderer
Google Inc. -- ANGLE -- OpenGL ES 2.0 (ANGLE 0.0.0.611)
GPU Accelerated Windows
1/1 Direct3D 10

SafeBrowser 543 solutions 2390 answers

Do you have Add-on Toolbar checked? That selects it to display; un-checked = don't display. Click to check or un-check. See https://support.mozilla.com/en-US/kb/Back%20and%20forward%20or%20other%20toolbar%20items%20are%20missing

  • View > Toolbars
  • Firefox button > Options > Toolbar Layout
  • Right-click in empty space at the end of the Tab Bar


If this reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.



Not related to your question.

You have multiple Java Console extensions that Java did not clean up when updating. The old versions are: 6.0.19, 6.0.20, 6.0.21, 6.0.22, 6.0.23
You can remove them by following these instructions: http://kb.mozillazine.org/Java#Multiple_Java_Console_extensions

Do you have Add-on Toolbar checked? That selects it to display; un-checked = don't display. Click to check or un-check. See https://support.mozilla.com/en-US/kb/Back%20and%20forward%20or%20other%20toolbar%20items%20are%20missing *View > Toolbars *Firefox button > Options > Toolbar Layout *Right-click in empty space at the end of the Tab Bar '''If this reply solves your problem, please click "Solved It" next to this reply when <u>signed-in</u> to the forum.''' ------------------------------ Not related to your question. You have multiple Java Console '''''extensions''''' that Java did not clean up when updating. The old versions are: 6.0.19, 6.0.20, 6.0.21, 6.0.22, 6.0.23<br/> You can remove them by following these instructions: http://kb.mozillazine.org/Java#Multiple_Java_Console_extensions

Question owner

Although I appreciate your suggested resolution, the Add-on bar, in tool bars, is in fact already checked, which is one of the reasons I do not fully comprehend the reason for the Add-on tool bar disappearing, whenever exiting the customization screen.

The Add-on tool bar appears upon entering view>tool bars> customization and I am able to place other add-on options in the tool bar, but as soon as I click on "Done" or simply exit the customization function by closing the screen by clicking on the "x" in the upper right corner, the tool bar continually disappears.

I apologize for my apparent lack of knowledge and/or ability to locate the "Firefox button" from which I can go to options and I am precluded from utilizing Ctrl+/ in the space alluded to in the other possible option. (I will return to the "HELP" screen and "FAQs", in an effort to identify the aforementioned "Firefox button")

But, once again, I sincerely appreciate your willingness to provide me with a suggested resolution. Respectfully, 10pinfvr

P.S. Although unrelated, in reviewing the "Uninstall" feature or "ALL" programs feature, only version 26 appears when utilizing either methodology, so I am unable to uninstall Java versions 19 - 23, referred to in the message I received, since they are not visible to me in the only modalities of which I'm aware.

But "Thank-you" for the recommendation

Mea Culpa, I forgot to check the Firefox extensions. I have since removed Java versions 19 - 23.

Although I appreciate your suggested resolution, the Add-on bar, in tool bars, is in fact already checked, which is one of the reasons I do not fully comprehend the reason for the Add-on tool bar disappearing, whenever exiting the customization screen. The Add-on tool bar appears upon entering view>tool bars> customization and I am able to place other add-on options in the tool bar, but as soon as I click on "Done" or simply exit the customization function by closing the screen by clicking on the "x" in the upper right corner, the tool bar continually disappears. I apologize for my apparent lack of knowledge and/or ability to locate the "Firefox button" from which I can go to options and I am precluded from utilizing Ctrl+/ in the space alluded to in the other possible option. (I will return to the "HELP" screen and "FAQs", in an effort to identify the aforementioned "Firefox button") But, once again, I sincerely appreciate your willingness to provide me with a suggested resolution. Respectfully, 10pinfvr P.S. Although unrelated, in reviewing the "Uninstall" feature or "ALL" programs feature, only version 26 appears when utilizing either methodology, so I am unable to uninstall Java versions 19 - 23, referred to in the message I received, since they are not visible to me in the only modalities of which I'm aware. But "Thank-you" for the recommendation Mea Culpa, I forgot to check the Firefox extensions. I have since removed Java versions 19 - 23.

Modified by 10pinfvr

cor-el
  • Top 10 Contributor
  • Moderator
17589 solutions 159130 answers
Try: *http://kb.mozillazine.org/Corrupt_localstore.rdf

Question owner

Cor-el,

 Despite numerous attempts to utilize your suggested "fix" to the disappearing tool bar problem, the results remained unchanged (i.e. tool bar immediately appears for customization, but immediately disappears upon exiting the tool bar customization screen).
 In an effort to determine if transactional sequencing may have any impact on affecting the appearance/disappearance of the add-on tool bar, in addition to attempting to resolve the current challenge through the use of the Firefox safe mode and reset tool bar functionality, I also elected to change the sequence in which I modified the desired "customization(s)", as well as the methodology for exiting the customization screen, Firefox safe mode (e.g. click-on Done, exit through X, exit and renter FF safe mode, with and without closing the customization screen, etc...).
 Further in addition to following the documented transactions, I also exited and reentered the Windows 7 O.S., as well as exiting and reentering Firefox safe mode and Firefox. 
 Unfortunately, despite the myriad of methodologies I attempted, the resultant effect remained the same (i.e. immediate disappearance of add-on tool bar, when clicking-on Done or exiting the screen and/or system).
 However, I did notice one anomaly, which heretofore had gone unnoticed due to benefits garnered rather than features lost. 
 Since the beginning of the this recent disappearing tool bar challenge, the add-ons which I select and locate on the URL address line continue to remain on screen, despite the disappearance of the add-on tool bar and all selected add-on "customizations" reflected in the add-on tool bar, regardless of any/other changes.   
 I want to thank you for your valuable contribution to the "hopeful" resolution of this most recent problem and I sincerely apologize for the delay in responding your suggestion. (During the past few days, we have been entertaining a relative from another country and as a result, I elected not to spend time on the computer).  Respectfully, 10pinfvr
Cor-el, Despite numerous attempts to utilize your suggested "fix" to the disappearing tool bar problem, the results remained unchanged (i.e. tool bar immediately appears for customization, but immediately disappears upon exiting the tool bar customization screen). In an effort to determine if transactional sequencing may have any impact on affecting the appearance/disappearance of the add-on tool bar, in addition to attempting to resolve the current challenge through the use of the Firefox safe mode and reset tool bar functionality, I also elected to change the sequence in which I modified the desired "customization(s)", as well as the methodology for exiting the customization screen, Firefox safe mode (e.g. click-on Done, exit through X, exit and renter FF safe mode, with and without closing the customization screen, etc...). Further in addition to following the documented transactions, I also exited and reentered the Windows 7 O.S., as well as exiting and reentering Firefox safe mode and Firefox. Unfortunately, despite the myriad of methodologies I attempted, the resultant effect remained the same (i.e. immediate disappearance of add-on tool bar, when clicking-on Done or exiting the screen and/or system). However, I did notice one anomaly, which heretofore had gone unnoticed due to benefits garnered rather than features lost. Since the beginning of the this recent disappearing tool bar challenge, the add-ons which I select and locate on the URL address line continue to remain on screen, despite the disappearance of the add-on tool bar and all selected add-on "customizations" reflected in the add-on tool bar, regardless of any/other changes. I want to thank you for your valuable contribution to the "hopeful" resolution of this most recent problem and I sincerely apologize for the delay in responding your suggestion. (During the past few days, we have been entertaining a relative from another country and as a result, I elected not to spend time on the computer). Respectfully, 10pinfvr
cor-el
  • Top 10 Contributor
  • Moderator
17589 solutions 159130 answers

Chosen Solution

Start Firefox in Troubleshoot Firefox issues using Safe Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).

Start Firefox in <u>[[Safe Mode]]</u> to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes). *Don't make any changes on the Safe mode start window. *https://support.mozilla.com/kb/Safe+Mode *https://support.mozilla.com/kb/Troubleshooting+extensions+and+themes