How to change FileZilla so that View/Edit opens .html in Notepad++, not Firefox

In FileZilla go to edit > settings...

In the left column scroll down to "file editing"...

Select it, then in the right column select "use custom editor" then browse to the .exe file on your comp for Notepad++.

Hope it helps. :)

[Additional Note: if you are experiencing the same problem that @theking2 has in the comment below, remember that FileZilla also imports your system's filetype associations. This may cause conflicts with your custom associations. You can disable system associations under edit > settings > file editing > Filetype Associations: look for the checkbox. Don't forget that you did this though - it may cause other problems down the road.]

Go to Edit / Settings / File Editing / Use custom editor (i use notepad++), then Filetype associations / html "C:\Program Files\Notepad++\notepad++.exe"

If you have 32-bit version of Notepad++ on a 64-bit OS then change the path to "C:\Program Files (x86)\Notepad++\notepad++.exe"

Pay close attention, you must specify the filetype before the full address to the application which will open it.

In FileZilla go to edit > settings...

In the left column scroll down to "file editing"..

and then click radio button use system's default editor for text file and always use default editor radio button click OK now all file be open in notepad

this help