Microsoft Outlook Web App causes Mozilla Firefox v. 17 to "not respond" every time I go to the page. Help?

As stated, every time I try to check my email, either by access it from the "most visited" tab on v. 17 or manually typing it into the address bar, It begins to load/open the page but after approx. 3 seconds causes the entirety of Firefox to "not respond" and freeze for about 5 seconds. While no harm done, this is extremely annoying. This is the only website to cause this problem and it is a fairly recent occurrence, starting about a week ago. My version of Firefox is up to date, I have cleaned my cache, cookies, history etc.
Does anyone have an idea what might be causing this and what steps I could take to either reduce its occurrences or completely stop this?
Thanks!

Start Firefox in [[Safe Mode|Safe Mode]] to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).
*Do not click the Reset button on the Safe mode start window or otherwise make changes.
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes
You can also check for problems with the places.sqlite database file in the Firefox Profile Folder that stores the history and bookmarks.
*http://kb.mozillazine.org/Bookmarks_history_and_toolbar_buttons_not_working_-_Firefox
*https://support.mozilla.org/kb/Bookmarks+not+saved#w_fix-the-bookmarks-file

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Microsoft Outlook Web App causes Mozilla Firefox v. 17 to "not respond" every time I go to the page. Help?

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