GlimmerBlocker is no longer maintained and should no longer be used as web sites have migrated from using plain http to using https (i.e. encrypted) which prohibits modification by a proxy unless you resort to install custom SSL certiticates on the client.
You should use a browser extension instead.
It was made as a hobby project during 2007-2008 by Peter Speck. It features both a custom http server and http client and a Mac OS X control panel.
TinyGrab (1.01b1) can't login when a proxy is used. It sends an invalid http request to the proxy: it contains an extranous newline after the URL in the request line, before the 'HTTP/1.1'
The workaround is to add the two hosts "tinygrab.com" and "grab.by" to the exception list:
See the screen shot on the page for Norton Live Update.