Hi, yes something has become corrupted or packet loss in a update.

Or it appears to be an issue that only affects users who have turned off cleartype font rendering within their windows settings. So a workaround for the moment would either be to turn cleartype back on or disabling hardware acceleration in Firefox: Firefox's performance settings Restart Firefox After.

If still issues 7min fix : uninstall Firefox. Then Delete the Mozilla Firefox Folders in C:\Program Files , C:\Program Files(x86) & C:\ProgramData Then restart system. Then run Windows Disk Cleanup. (Note: This should be Pinned and run Weekly, If never done below expect 10's of gig's) Then run it again and click the button that says Cleanup System Files. Note: your Firefox Profile is saved. But you should make a back up before you do :

• https://support.mozilla.org/en-US/kb/back-and-restore-information-firefox-profiles
• https://support.mozilla.org/en-US/kb/export-firefox-bookmarks-to-backup-or-transfer

Reinstall with Current Release Firefox 59.0.1 with a Full Version Installer

• https://www.mozilla.org/firefox/all/

Please let us know if this solved your issue or if need further assistance.

"Disk Cleanup" does not exist in this version of windows 8.1... and, no, I'm not going to upgrade to win10.

Did everything else including a full reinstall. I had already installed 59.0.1 prior to my post.

The problem is still there. Based on my experience (starting with Netscape in 1994) this is not a "packet corruption" nor a cleartype problem.

FireFox has, for some reason, decided to toggle a setting that prevents opening a page from a page that has a different domain url. If I had to guess, I think it has something to do with version 59.

"redirect" in about:config yields nothing, but hints that there are about:config settings that may control this.

Thanks for your response. I will pursue this and report back if I find something.

Beverly Howard

Found it...

accessibility.blockautorefresh

set it to default, "false"

Now... the question is, "what toggled this????"

Beverly Howard

Would not know. As my are set to False. I would think that that is done from the check mark in Block Accessibility Features from Options - Performance as it creates excessive use of ram and cpu cores when not being used with Accessibility programs/hardware, https://support.mozilla.org/en-US/kb/accessibility-features-firefox-make-firefox-and-we But am not sure, would have reset those then try the Check Box.

So since you have turned them from default True to False, no idea, but would say that was not the issue. Or maybe it was But it is doing what you want. As mine is at True.

As for Disk Cleanup it is in every version of Windows https://support.microsoft.com/en-ca/help/17421/windows-free-up-drive-space

Based on my own experience from 94 and Netscape it certainly can be "packet corruption" and loss.

As for Cleartype if you do not wish to follow the instructions to fix a known bug that has come up then that is up to you : https://bugzilla.mozilla.org/show_bug.cgi?id=1435472

Please mark this solved with the answer that was the Solution, Yours.

>> So since you have turned them from default True to False <<

To clarify, it was set to True and I set it back to the mozilla default of False.

fwiw, I found the setting by going through the "non default" settings.

Prevent accessibility services from accessing your browser was/is unchecked.

Solution counts seem to be important, so, I'll add to yours.