Cannot install add-ons in Firefox 4 "[Add on] could not be installed because Firefox failed to modify the necessary.".
I tried to install add-ons for Firefox 4, but were unsuccessful.
If I try to install inside the about: addons, the add-on will download, but then the installation bar will not change.
If I try to install from addons.mozilla.org, the add-on download but then I get a message in the info box on site (at the side of the address bar) which reads, "[module] could not be installed because Firefox failed to modify the necessary."
If I try to install any other modules after that, I get an error.
I'm under Ubuntu 10.10 on a Toshiba Satellite U400.
On config variables xpi: enabled = true.
I'm having this problem. I am also under Ubuntu 10.10 and Firefox 4.0 (Canonical version 1.0) 32-bit.
When I try to install the Greasemonkey addon (and other addons), it downloads, but the installation progress bar remains at 0%. I can not also cancel installation. If I try, I get the error:
Error: Cannot cancel install of https://addons.mozilla.org/firefox/downloads/latest/748/addon-748-latest.xpi?src=addondetail of that State (5)
Source file: resource://gre/modules/XPIProvider.jsm
Line: 5168
When you try to install, I get this error in the error console:
Error: this.installLocation is not defined
Source file: resource://gre/modules/XPIProvider.jsm
Line: 5751
I read on the troubleshooting page of Firefox that xpinstall.enabled should be set to true in the configuration: about, but there is not in my list of config, so I tried to add it, but it made no difference.
Tags: Firefox
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