See: Tools > Options > Advanced > General : Accessibility : [ ] "Warn me when web sites try to redirect or reload the page"

See: Advanced settings for accessibility, browsing, system defaults, network, updates, and encryption

See also: http://kb.mozillazine.org/accessibility.blockautorefresh

Note that there may be more than one redirect and that you thus may have click Allow more than once.

The setting in "Options > Advanced > General" is meant as an accessibility feature, as you can see by the label of that section, so that people with disabilities or people who use screen readers do not get confused and is not meant as a safety protection to stop redirecting.

• http://kb.mozillazine.org/accessibility.blockautorefresh
• http://kb.mozillazine.org/Accessibility_features_of_Firefox

Though it's not an 'accessibility' issue for me, I generally like to know when I'm being redirected, so I don't wish to disable the option. However, it would be useful to have the ability to apply site exceptions as occasionally interferes with the normal functionality of particular sites, such as online banking facilities.