Hello, can you try to clear your cookies and cache.

Note: This will temporarily log you out of all sites you're logged in to. To clear cache and cookies do the following:

1. Go to Firefox > History > Clear recent history or (if no Firefox button is shown) go to Tools > Clear recent history.
2. Under "Time range to clear", select "Everything".
3. Now, click the arrow next to Details to toggle the Details list active.
4. From the details list, check Cache and Cookies and uncheck everything else.
5. Now click the Clear now button.

Further information can be found in the Clear your cache, history and other personal information in Firefox article.

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Thank you.

Hi, it may some tourbles with your Firefox Internet browser, you may try to clear out some cookies, useless add-ons, and browsing history from Firefox to see if the problem can be solved. 1. Open Firefox browser. Click on Tools, then Options, select Privacy. 2. Click “Remove individual cookies”. 3. In the Cookies panel, click on “Show Cookies.” Remove a single cookie click on the entry in the list and click on the “Remove Cookie button”. 4. To remove all cookies click on the “Remove All Cookies button.” 5. Click tools again, click on add-ons. Select Extensions. remove useless or suspicious extensions.

You may have switched on caret browsing.

• http://kb.mozillazine.org/accessibility.browsewithcaret

You can press F7 (Mac: fn + F7) to toggle caret browsing on/off.

• Tools > Options > Advanced > General > Accessibility: [ ] "Always use the cursor keys to navigate within pages"

• http://kb.mozillazine.org/Scrolling_with_arrow_keys_no_longer_works
• http://kb.mozillazine.org/Accessibility_features_of_Firefox