I have used both of these tax sites on Firefox without issues: * https://www.hrblock.com/online-tax-filing/ * https://turbotax.intuit.com/personal-taxes/online/free-edition.jsp You may want to look into either of these sites to see which you prefer. H&R Block allows more items to be filed for free while TurboTax seems to be removing things that were free in years before then charging for them. Ex. On TurboTax, the Student loan interest deduction used to be free a few years ago, now you must upgrade to the Deluxe version to claim this deduction. ([https://ttlc.intuit.com/community/college-education/discussion/can-i-use-the-free-edition-if-i-want-to-deduct-student-loan-interest/00/709223 Link to reviews confirming that]) Just something to keep in mind. There's also another tool to file for free directly from the IRS. I have used it on Firefox before as well: https://www.irs.gov/e-file-providers/free-file-fillable-forms More details/FAQ: https://www.irs.gov/filing/free-file-do-your-federal-taxes-for-free

You can check the connection settings and check for possible issues with a Proxy or VPN service. *Settings -> General -> Network: Connection -> Settings If you do not need to use a Proxy to connect to internet, select "No Proxy" if "Use the system proxy settings" or one of the others do not work properly. See also: *https://support.mozilla.org/en-US/kb/connection-settings-firefox *https://support.mozilla.org/en-US/kb/websites-dont-load-troubleshoot-and-fix-errors

Thank you both for your replies. I appreciate the information you provided. Bob