Have you tried installing from the link below? It indicates compatibility with Firefox 5. Some other sites may have older versions of the add-on that are not Firefox 5 compatible. The first version compatible with Firefox 5 was released in March 2011.

• https://addons.mozilla.org/en-US/firefox/addon/flashgot/

Does installing from the above site work for you?

no , still say the same thing.

See:

• http://kb.mozillazine.org/Preferences_not_saved

This can also be a problem with the file(s) that store the extensions registry.

Delete the files extensions.* (extensions.sqlite, extensions.rdf, extensions.cache, extensions.ini) 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

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 an update.

that dont work either ok here the problem i can not no longer drag and drop out of icefilms.info movies icon into jdownloader . i assume it is flashgot for firefox extensions when i press install icon the little window pop up say it not compatible with firefox 5 . how can i fix it if not how can i go back to firefox4? thz

I got this error, but in a different manner. I can install Flashgot itself normally, on its own. But, when I start JDownloader, and then try to use its "install Firefox integration" option, I get this error. It happens whether I've installed or uninstalled the Flashgot extension.

I resolved the issue by rolling back from Firefox 5 to Firefox 3.6. This was on a new installation of WinXP Pro and a new installation of Firefox 5.

ok thanks but how can i roll back 5 to 3.6?

there is a another way of doing it thanks to dc366,member, on jdownloader forum . his comment on it.

Icefilms recently changed a little bit. This is what you will have to do: 1) In your web browser right click on Source #1 and click open frame in new tab. 2) In the newly opened tab, click on Source #1 3) You will be forwarded to the megaupload website. Copy the address bar.

i try it and it works : )