What does this error message mean? "Blank Tab Multivariate Test Addon could not be installed because Firefox cannot modify the needed file."

I am running Firefox 6 Beta and have now recieved 2 popups about the Blank Tab Multivariate Test. I finally found info on how to install it. However, when I went to the page suggested and tried to install I got the above error message. I want to know how to solve this problem so I can participate in the test.

That means that the extension lacks the required <nowiki><em:unpack>true</em:unpack></nowiki> line in the file install.rdf to make sure that the file gets unpacked after installing. 
Firefox 4 and later no longer unpacks an extension automatically, but renames the XPI file to the ID of the extension and copies that file to the extensions folder in the Firefox Profile Folder.
*http://kb.mozillazine.org/Profile_folder_-_Firefox
*https://developer.mozilla.org/en/install_manifests#unpack
*https://developer.mozilla.org/En/Updating_extensions_for_Firefox_4.0#XPI_unpacking

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Error: "FT DeepDark 11.3.1 could not be installed because Firefox cannot modify the needed file." What does this mean?

In an earlier version (Firefox v.31) on this, and (presently) on two other PC's, I was/am able to run add-on FT DeepDark 11.3.1 without any problems. It was only recently - after updating to v.32.0.3 on this PC that this situation started. The PC in question is a Dell Dimension 8400 Intel P4 running Windows 7, though I'm thinking it may have something to do with the newer version of Firefox. Could anyone help me with this? I like this add-on because it is easier in my eyes when browsing the internet. Thanks
PS: Attempted to install the troubleshooter, and again I received a similar error: "Troubleshooter could not be installed because Firefox cannot modify the needed file."

This error has been reported before in this bug:
https://bugzilla.mozilla.org/show_bug.cgi?id=730040#c21
Please read that bug I linked you to and let me know if the last comment in the bug solves your problem. Apparently the problem is about the addon .xpi file being read-only. Try right-clicking it, going to Properties and unchecking the "Read-only" attribute box at the bottom of the dialog. Click Apply, then OK.

When going through the download process with social monkee and getting to the point of adding it to firefox I get the following message: 'Social Monkee could not be installed because firefox cannot modify the needed file'. How can this be fixed?

When going through the download process with social monkee and getting to the point of adding it to firefox I get the following message: 'Social Monkee could not be installed because firefox cannot modify the needed file'. How can this be fixed?

That is usually caused by a missing unpack directive (<em:unpack>true</em:unpack>) in the file install.rdf of that extension.
See https://developer.mozilla.org/En/Updating_extensions_for_Firefox_4.0#XPI_unpacking
-----

I cannt install erail.in. note is"erail pluginfor firefox could not be installed because firefox cannot modify the needed file". what should i do now

when i go to www.erail.net for train details. message as"click here to install plugin" displayed and clicked for install then the message "erail plugin for firefox could not be installed because firefox cannot modify the needed file"
so, further what should i do
regards. madhu

You usually get this error if you try to install an extension that needs to be unpacked to work properly. 
Current Firefox version do not unpack an extension automatically, but rename the xpi file to the extension's GUID.
An extension that needs to be unpacked should have an unpack flag in its install.rdf file
<pre><nowiki><em:unpack>true</em:unpack></nowiki></pre>
*https://developer.mozilla.org/En/Updating_extensions_for_Firefox_4.0#XPI_unpacking
You can try to set the extensions.alwaysUnpack pref to true on the about:config page.
The extension seems to install, but I haven't tested if it works.
*https://addons.mozilla.org/firefox/addon/erail-plugin-for-firefox/

I keep getting the error "zotero could not be installed because firefox cannot modify the needed file". Any suggestions on how to fix this?

After downloading Zotero (a plug in that is in theory custom-designed for firefox), I get an error message that says "zotero could not be installed because firefox could not modify the needed file". That's all the detail I have.

You get this error if you install an extension that needs to be unpacked in order to work properly, but this isn't happening. The default is to copy the file to the extensions folder and rename the file part to the ID of the extension.
*https://developer.mozilla.org/En/Updating_extensions_for_Firefox_4.0#XPI_unpacking
You can try to set the extensions.alwaysUnpack pref(s) on the about:config page to true.
It is possible that there is a problem with the file(s) that store the extensions registry.
Delete the extensions.* files (e.g. extensions.sqlite, extensions.ini) and compatibility.ini in the Firefox profile folder to reset the extensions registry.
*https://support.mozilla.org/kb/Profiles
New files will be created when required.
See "Corrupt extension files":
*http://kb.mozillazine.org/Unable_to_install_themes_or_extensions
*https://support.mozilla.org/kb/Unable+to+install+add-ons
If you see disabled or not compatible extensions in "Firefox/Tools > Add-ons > Extensions" then click the Tools button at the left end side of the Search Bar to check if there is a compatibility update available.
If this hasn't helped then also delete the addons.sqlite file if present.

Error, lightbeam could not be installed because Firefox cannot modify the needed file.

Was trying to install the addon Lightbeam and keep getting the error. I am using version 24 on Firefox and the latest version of Lightbeam.

You get this error if you install an extension that needs to be unpacked in order to work properly, but this isn't happening. The default is to copy the file to the extensions folder and rename the file part to the ID of the extension.
*https://developer.mozilla.org/En/Updating_extensions_for_Firefox_4.0#XPI_unpacking
You can try to set the extensions.alwaysUnpack pref(s) on the about:config page to true.
It is possible that there is a problem with the file(s) that store the extensions registry.
Delete the extensions.* files (e.g. extensions.sqlite, extensions.ini) and compatibility.ini in the Firefox profile folder to reset the extensions registry.
*https://support.mozilla.org/kb/Profiles
New files will be created when required.
See "Corrupt extension files":
*http://kb.mozillazine.org/Unable_to_install_themes_or_extensions
*https://support.mozilla.org/kb/Unable+to+install+add-ons
If you see disabled or not compatible extensions in "Firefox/Tools > Add-ons > Extensions" then click the Tools button at the left end side of the Search Bar to check if there is a compatibility update available.
If this hasn't helped then also delete the addons.sqlite file if present.

When i try to add an add on that is supposed to be compatible I get a message that says it's not installed because firefox cannot modify a needed file

I just upgraded to FF 5.o. Many of my addons state that they are compatible, but when I try to install them, I press "install" then a message pops up saying that it can't be installed because FF cannot modify the needed file. How do I change this?

That probably means that the extension lacks the required <nowiki><em:unpack>true</em:unpack></nowiki> line in the file install.rdf to make sure that the file gets unpacked after installing.
*https://developer.mozilla.org/En/Updating_extensions_for_Firefox_4.0#XPI_unpacking
Firefox 4 and later no longer unpacks an extension automatically, but renames the XPI file to the ID of the extension and copies that file to the extensions folder in the Firefox Profile Folder.
Try to set the Boolean pref extensions.alwaysUnpack to true on the about:config page.
*http://kb.mozillazine.org/about:config

Cannot install "plugin/extension name" because Firefox cannot modify the needed file. This is happening for any and every kind of plugin theme you could think of. This started when I upgraded to Firefox 11 just now.

I just upgraded to Firefox 11.0 (unwillingly) and I get the following whenever I try to install ANYTHING at all. Themes, add-ons...it doesn't matter, the result is the same.
"Cannot install "plugin name here" because Firefox cannot modify the needed file.
If the fix requires installing a plugin...well, that's not going to work obviously.
Anybody know how to fix this?

You shouldn't see such an error. 
That error usually indicates that an extension or dictionary needs to be unpacked to make it work.
Firefox 4 and later no longer unpacks an extension automatically, but renames the XPI file to the ID of the extension and copies that file to the extensions folder in the Firefox Profile Folder.
If an extension needs to be unpacked then there should be an unpack directive (<nowiki><em:unpack>true</em:unpack></nowiki>) in the install.rdf file of that extension
You can try to set the Boolean pref extensions.alwaysUnpack to true on the about:config page.
*http://kb.mozillazine.org/about:config
* https://developer.mozilla.org/En/Updating_extensions_for_Firefox_4.0#XPI_unpacking

What does this error message mean and how do I solve it? "Sorry, one or more of the following command-line tools was not found: /usr/bin/lsbom, /bin/pax, /bin/mkdir, /bin/chmod, or /usr/bin/update_prebinding."

When I try to open up this program, Pacifist, I receive this error message. Here's a screenshot. http://i.imgur.com/v717w.jpg What does this error message mean and how do I solve it?

It sounds like some of the Unix Executable commands were removed (or the permissions to those were modified) out of the /usr/bin/ folder. You can try opening disk utility and repairing permissions on Macintosh HD or you can reboot your computer and holding down option-r when it comes back up to reinstall Lion again. This will not delete your personal information or applications you have installed but it would be best to back it up to Time Machine before you do. The article on how to do this is here. (http://www.apple.com/macosx/recovery/) I have had to do this before and it works like a charm. It should fix your issue but grab a cup of coffee because its going to take about 35 - 40 minutes depending on how fast your computer is.

What does this error message mean? disc recording not found

What does this error message mean? disc recording not found

Often it suggests issues with device filters in your registry. But it's probably best to check the situation more closely.
Could you post your diagnostics for us please?
In iTunes, go "Help > Run Diagnostics". Uncheck the boxes other than DVD/CD tests, as per the following screenshot:
... and click "Next".
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... click the "Copy to Clipboard" button and paste the diagnostics into a reply here.

TS1846 What does this error message mean?

What does this error message mean? I am trying to burn a project to DVD...
Formatting was not successful. Layer 0 exceeds the maximum layer size allowed. Please choose a suitable marker location that will support this condition.

The project is 1:22:30 - 1080P HD (4.9GB)...I am using the share drop down and hitting DVD...I am using a DVD+R Dual Layer 8.5GB...It processes for about an hour and a half the status bar gets almost done and then the error message comes up...thanks for any help you can give me

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What does this error message mean? MFMessageErrorDomain error 1028.

What does this error message mean?
MFMessageErrorDomain error 1028.
I can't seem to delete a message from my mailbox. The above error message comes up every time and the message then reappears in my inbox.

Back up all data. Rebuild the mailbox. Try to delete the message again. If you still can't, continue.
From the Mail menu bar, select
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choose
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What does this error message mean: "Filename: Mips32.ari TFTP Error: 'File not found' in AP-105"?

Question: What does this error message mean: "Filename: Mips32.ari TFTP Error: ‘File not found’ in AP-105"?
Product and Software: This article applies to AP-105.
The root cause of this error is that the AP cannot perform a code upgrade.
Scenario 1
Check the ArubaOS code.
The minimum requirement to bring up an AP-105 is ArubaOS 3.3.3+ or ArubaOS 3.4.1+.
If the controller is running pre 3.3.3 code, upgrade the code to fix the issue.
Scenario 2
If the AP is not connected to the controller directly, bring up the AP in the controller and then connect it to the desired location. This process loads mips32.ari to the AP so that the AP can upgrade the code.
Scenario 3
The AP has no power adapter and you want to use the PoE feature. A few controller series like the 200 and 3000 Series do not support PoE. In this case, the AP cannot be terminated physically in the controller. Instead, connect the AP to the PoE switch, which is connected to the controller. Then assign a static IP configuration for the AP using the following commands:
apboot> setenv ipaddr <ip address>
apboot> setenv netmask <netmask>
apboot> setenv gatewayip <ip address of the gateway>
apboot> setenv master <ip address of the master>
apboot> setenv serverip <ip address of the TFTP server>
apboot> setenv bootcmd tftp
apboot> save
apboot> boot
Locally configure the TFTP server for the AP and load the mips32.ari file from the controller with the help of the TFTP application.

I want to download this file Mips32.ari for AP-105 device. Please give me this file download link. APBoot 1.2.4.4 (build 26618)
Built: 2011-01-07 at 13:42:04Model: AP-10x
CPU: AR7161 revision: A2
Clock: 680 MHz, DDR clock: 340 MHz, Bus clock: 170 MHz
DRAM: 128 MB
POST1: passed
Copy: done
Flash: 16 MB
PCI: scanning bus 0 ...
dev fn venID devID class rev MBAR0 MBAR1 MBAR2 MBAR3
00 00 168c 0029 00002 01 10000000 00000000 00000000 00000000
01 00 168c 0029 00002 01 10010000 00000000 00000000 00000000
Net: eth0
Radio: ar922x#0, ar922x#1Hit <Enter> to stop autoboot: 0
Checking image @ 0xbf100000
Invalid image format version: 0xffffffff
Checking image @ 0xbf800000
Invalid image format version: 0xffffffff
eth0 up: 1 Gb/s full duplex
DHCP broadcast 1
DHCP IP address: 192.168.x.xx
DHCP subnet mask: 255.255.255.0
DHCP def gateway: 192.168.x.xx
DHCP DNS server: 192.168.x.xx
DHCP DNS domain: xx
ADP multicast 1
ADP broadcast 1
ADP multicast 2
checksum bad
ADP broadcast 2
checksum bad
ADP multicast 3
checksum bad
checksum bad
checksum badRetry count exceeded
DNS request 1 for aruba-master to 192.168.x.xx
checksum bad
checksum bad
checksum bad
T Using eth0 device
TFTP from server 192.168.x.xx; our IP address is 192.168.x.xx
Filename 'mips32.ari'.
Load address: 0x2000000
Loading: checksum bad
T T checksum bad
T checksum bad
checksum bad
checksum bad
T checksum bad
checksum bad
T T checksum bad
T checksum bad
checksum bad
T T T
Retry count exceeded; starting again
eth0 up: 1 Gb/s full duplex
checksum bad
checksum bad
checksum bad
checksum bad
checksum bad
checksum bad
checksum bad
checksum bad
checksum bad
checksum bad
checksum bad
checksum bad
checksum bad
checksum bad
checksum bad
checksum bad
checksum bad
checksum badARP Retry count exceeded; starting again
eth0 up: 1 Gb/s full duplexchecksum bad
checksum bad
checksum bad
checksum bad
checksum bad
checksum bad
checksum bad
checksum bad ThanKs :)

Firefox cannot modify the needed file. I get this message when I try to add a theme. I am using Linux Mint 14.

I am currently using Linux Mint 14 with Firefox 21. I am trying to add new themes and add ons, but I keep getting the message "firefox cannot modify the needed file in linux". How can I correct this?
Thanks

Click the Firefox button at the top left, then click the ''Help'' menu and select ''Troubleshooting Information'' from the submenu. If you don't have a Firefox button, click the Help menu at the top and select ''Troubleshooting Information'' from the menu. Go to Open Profile Directory (or something similar) and delete a file named user.js

What does this error message mean? "Blank Tab Multivariate Test Addon could not be installed because Firefox cannot modify the needed file."

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