Cant get certain sites to open on Firefox
Certain sites (usually .asp) won't open in my Firefox browser. For example, here: http://www.cic.gc.ca/english/immigrate/sponsor/index.asp The header says "index.asp (GIF image, 1 x 1, pixels)"
Solución elegida
If you use extensions (3-bar button/Tools > Add-ons > Extensions) that can interfere with loading content (e.g. Adblock Plus, NoScript, Flash Block, Ghostery) then make sure that such extensions do not interfere with loading content. There is security software that can interfere with loading content, so check that as well.
Some firewalls like Kaspersky can block content and send a 1x1 GIF image instead.
Kaspersky: Protection > Firewall > Filtration system: disable the "Banner Ad Blocker"Leer esta respuesta en su contexto 👍 1
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Solución elegida
If you use extensions (3-bar button/Tools > Add-ons > Extensions) that can interfere with loading content (e.g. Adblock Plus, NoScript, Flash Block, Ghostery) then make sure that such extensions do not interfere with loading content. There is security software that can interfere with loading content, so check that as well.
Some firewalls like Kaspersky can block content and send a 1x1 GIF image instead.
Kaspersky: Protection > Firewall > Filtration system: disable the "Banner Ad Blocker"
That worked!! Although it took me a bit to actually find it -- not under "Firewall > Filtration system" (doesn't exist) but under "Protection >Anti-banner." THANKS!!