There are some sites that do not refresh in Firefox - for example if I use the flight tracker in easyjet it does not supply the details. It works in MS Explorer
When I access some sites with Firefox and try to use a search facility nothing happens. For example the easyjet flight tracker. I enter the flight number and hit "Search" nothing happens. Note that the cursor changes to the "finger pointer" when I hover over the search, so the system obviously recognises that the button is valid for selection. Note that if I use the MS Internet Explorer browser there is no problem. I have noticed this happening on other sites. For example the Daily Telegraph site will not display some photos in Firefox but will in Explorer. Thanks
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Start Firefox in Safe Mode {web Link} by holding down the <Shift>
(Mac=Options) key, and then starting Firefox.
A small dialog should appear. Click Start In Safe Mode (not Refresh).
Is the problem still there?
There is security software like Avast and Kaspersky and BitDefender and ESET that intercept secure connections and send their own certificate.
http://www.ehow.com/how_11385212_troubleshoot-reset-connection-firefox.html
https://support.mozilla.org/en-US/kb/server-not-found-connection-problem
https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can
https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message
https://support.mozilla.org/en-US/kb/connection-untrusted-error-message
http://kb.mozillazine.org/Error_loading_websites
https://support.mozilla.org/kb/troubleshoot-SEC_ERROR_UNKNOWN_ISSUER
This Connection is Untrusted is sometimes caused because the computer system clock is wrong. Check the time / date / time zone settings.
I tested this page: https://www.easyjet.com/us/flight-tracker
The form is wired to Google Analytics and if you block Google Analytics, using either an add-on or Firefox's "Tracking Protection" feature, then the form is inactive.
If you are using a private browsing window and need to temporarily suspend tracking protection, please see this article for information on how to use the "shield" icon at the left end of the address bar: What happened to Tracking Protection?.