When I open a file it wont stop opening the same window?
When a PDF file opens in a new tab it keeps opening tabs and will not stop or load the file.
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More than likely that is an issue with what you have selected to open PDF files.
Please see these support articles: https://support.mozilla.org/en-US/kb/firefox-repeatedly-opens-empty-tabs-or-windows
https://support.mozilla.org/en-US/kb/change-firefox-behavior-when-open-file