Click on the menu button (three horizontal lines) in the top right corner of Firefox.
   Select Settings (or Options).
   Go to the Privacy & Security panel.
   Under Cookies and Site Data, click on Clear Data.
   Check both options (Cookies and Site Data, Cached Web Content) and click Clear.

   Click on the menu button and select Add-ons and themes.
   Go to the Extensions tab.
   Disable all extensions by toggling them off.
   Restart Firefox and try accessing Outlook again.

   Open Outlook in Firefox.
   Click on the lock icon in the address bar.
   Ensure that permissions for the site (like Cookies, Pop-ups, etc.) are set correctly. You may want to allow all permissions temporarily to see if that resolves the issue.

   Click on the menu button, go to Help, and select Restart with Add-ons Disabled.
   In the Safe Mode dialog, click Restart.
   Try accessing Outlook again.

   Click on the menu button and select Help.
   Click on About Firefox. Firefox will check for updates and install them if available.
   Restart Firefox after updating.

   Click on the menu button and select Settings.
   Scroll down to the Performance section.
   Uncheck Use recommended performance settings.
   Uncheck Use hardware acceleration when available.
   Restart Firefox and check Outlook again.

   Type about:profiles in the address bar and press Enter.
   Click on Create a New Profile and follow the prompts.
   Start Firefox with the new profile and try accessing Outlook.

'''Step 1: Clear Cache and Cookies''' Click on the menu button (three horizontal lines) in the top right corner of Firefox. Select Settings (or Options). Go to the Privacy & Security panel. Under Cookies and Site Data, click on Clear Data. Check both options (Cookies and Site Data, Cached Web Content) and click Clear. '''Step 2: Disable Extensions''' Some browser extensions can interfere with website functionality. Try disabling them: Click on the menu button and select Add-ons and themes. Go to the Extensions tab. Disable all extensions by toggling them off. Restart Firefox and try accessing Outlook again. '''Step 3: Check Site Permissions''' Open Outlook in Firefox. Click on the lock icon in the address bar. Ensure that permissions for the site (like Cookies, Pop-ups, etc.) are set correctly. You may want to allow all permissions temporarily to see if that resolves the issue. '''Step 4: Start Firefox in Safe Mode''' Starting Firefox in Safe Mode can help identify if the issue is caused by extensions or settings: Click on the menu button, go to Help, and select Restart with Add-ons Disabled. In the Safe Mode dialog, click Restart. Try accessing Outlook again. '''Step 5: Update Firefox''' Ensure that you are using the latest version of Firefox: Click on the menu button and select Help. Click on About Firefox. Firefox will check for updates and install them if available. Restart Firefox after updating. '''Step 6: Check for Hardware Acceleration''' Sometimes, hardware acceleration can cause display issues: Click on the menu button and select Settings. Scroll down to the Performance section. Uncheck Use recommended performance settings. Uncheck Use hardware acceleration when available. Restart Firefox and check Outlook again. '''Step 7: Test in a New Profile''' Creating a new Firefox profile can help determine if the issue is related to your current profile: Type about:profiles in the address bar and press Enter. Click on Create a New Profile and follow the prompts. Start Firefox with the new profile and try accessing Outlook. '''Step 8: Try a Different Browser''' If the issue persists, try accessing Outlook in a different browser (like Safari or Chrome) to see if the problem is specific to Firefox. Step 9: Check for macOS Updates Ensure that your macOS is up to date, as system updates can sometimes resolve compatibility issues.