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I am trying to up date from 3.6 to 5. Will not pass 97% of completion. How can I shut down Firefox so it will complete the installation?

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After downloading the latest Firefox, a box shows 97%. Then another box tells me Firefox will need to be shut down to continue. When I shut down Firefox either one it's own, or by a full restart, the same box returns, telling me to shut down Firefox. I can noy go pass this section to complete the installation.

After downloading the latest Firefox, a box shows 97%. Then another box tells me Firefox will need to be shut down to continue. When I shut down Firefox either one it's own, or by a full restart, the same box returns, telling me to shut down Firefox. I can noy go pass this section to complete the installation.

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IM HAVING THE SAME PROBLEM AND CANT SEEM TO NAVIGATE THROUGH THIS SITE TO GET A SOLUTION?