https://www.bing.com/search?q=filesendsute&pc=MOZI&form=MOZSBR Remove FileSendSuite search

After the above, You may have ad/mal-ware. Further information can be found in this article; https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-caused-malware?cache=no

Run most or all of the listed malware scanners. Each works differently. If one program misses something, another may pick it up.

There are other things that need attention. The System Details list next to the question shows an outdated Shockwave Flash 22.0 r0 plugin. Make sure all plugins are up-to-date.

You can download the latest Flash player versions for Firefox on this page:

• https://get.adobe.com/flashplayer/otherversions/