One of your add-ons might be the culprit too. Try running Firefox in Diagnose Firefox issues using Troubleshoot Mode with all add-ons disabled. If that solves the problem, see Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems and possibly Troubleshoot issues with plugins like Flash or Java to fix common Firefox problems Or you can try creating a new/test profile by going to Managing Profiles. Also If you close Firefox, then start Firefox in Safe Mode, does the problem still occur? For instructions on starting in Safe Mode, see Diagnose Firefox issues using Troubleshoot Mode.

Screenshot please?

See: http://www.wikihow.com/Take-a-Screenshot-in-Microsoft-Windows

After you have saved the screenshot, click Browse located on the bottom of your reply text box. See the attached screenshot

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You can try to disable redirection warnings:

1. On the menu bar, on top of Firefox, select Tools

2. In the drop-down menu, select options

3. Select the Advanced Panel

4. Under Accessibility, disable Warn me when sites try to redirect or reload the page

5. OK