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I use some proxy software. When I login to some sites, if I change proxy settings, firefox removes my cookies and I must login again. It occurs on every site. Also when I close firefox and open it again, I should login to sites even if I chose remember me option on them.

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up vote 0 down vote accepted

It was Proxy Selector add-on that made firefox delete cookies. In default preferences of this plugin, every time proxy changes, firefox must clean cookies. Change it and cookies will be OK.

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