Hi, please try updating to 58.0.2 There was a problem with Outlook which should have been fixed now https://www.mozilla.org/en-US/firefox/58.0.2/releasenotes/

Open the 3-bar menu > Help > About Firefox; you can also go to Options (General) - Firefox Updates. Alternatively, you can press the Alt key to bring up the main menu bar > Help > About Firefox. More - Update Firefox to the latest release.

If it still doesn't work, try clearing the cache - How to clear the Firefox cache

Incidentally, you have an old version of Flash which if you intend to use, should be updated -

• Install FlashPlayer - take care to deselect any optional offers!

If your question is resolved by this or another answer, please take a minute to let us know. Thank you!

This did not fix my problem but thank you for your fix recommendations

Start Firefox in Safe Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration is causing the problem.

• switch to the DEFAULT theme: "3-bar" menu button or Tools -> Add-ons -> Appearance
• do NOT click the "Refresh Firefox" button on the Safe Mode start window

• https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

Clear the cache and remove the cookies from websites that cause problems via the "3-bar" Firefox menu button (Options/Preferences).

"Clear the cache:

• Options/Preferences -> Privacy & Security -> Cached Web Content: "Clear Now"

"Remove the cookies" from websites that cause problems.

• Options/Preferences -> Privacy & Security -> "Use custom settings for history" -> Cookies: "Show Cookies"