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I want to open a file that I download (using firefox) with a running instance, instead of it opening it a new instance.

For example: If I have gedit open and I download a textfile how can I make sure the textfile will be opened (automatically) by this running gedit instance?

I have found this: How to avoid opening a second instance? but it is still unclear for me how and mainly where to apply this.

Note: I am not specifically interested in opening files with gedit, but more in the general problem.

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In gedit, for example, you can do this by following the instructions from the following image:


In the same way you can open files from any associated program. In this mod you will not open for sure another instance of the program.

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