Firefox version 3.6.8 on Ubuntu 10.04

James Hogarth james.hogarth at
Mon Aug 16 10:24:37 UTC 2010

>> Edit>Preferences>Security>Warn me when sites try to install add-ons....
> To quote from the FF help for the 'Warn me when sites try to install
> add-ons' on that dialog
> 'Warn me when sites try to install add-ons: Firefox will always ask
> you to confirm installations of add-ons.

Note it says *always*

> To prevent unrequested
> installation prompts which may lead to accidental installations,
> Firefox warns you when a website tries to install an add-on and blocks
> the installation prompt.

So if this is ticked and firefox doesn't know the site it will block
the installation box from even appearing with a warning.

> To allow installations from a specific site,
> click Exceptions..., enter the site name, and click Allow. Uncheck
> this optionpreference to disable the warning for all sites.'

If you want a box from a site (such as have it in
the exceptions so that installation boxes appear.

Unchecking the box removes this warning for all sites.

Looks perfectly clear to me... and as tested just now with it
unchecked the install box appears with the usual 3 second countdown
before you can click install.... so the user would still have to
confirm the installation of the extension and it won't just 'install
itself via javascript' as a previous respondent suggested as possible.


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