When I try to install download helper I am told to restart firefox. I do, and go back to the same "restart firefox" message.
I have tried to install "download helper" as a Firefox add-on. I hit the install button, but then get a box telling me to restart firefox. I do, but end up at the same page with the same "restart firefox" message everytime I try to install "download helper."
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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":
- http://kb.mozillazine.org/Unable_to_install_themes_or_extensions
- https://support.mozilla.org/kb/Unable+to+install+add-ons
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 do a compatibility check or see if there is a compatibility update available.
See also: