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Go to "
about:preferences#home
" (Options in top right menu > home), set "Homepage and new windows" to Custom URLs and enter "file:///path/to/the/index.html" -
Set "New tabs" to "Blank Page" then go to the installation folder of Firefox, "C:\Program Files\Mozilla Firefox" is default on Windows, open "defaults" then "pref" and put the "autoconfig.js" (from "Firefox_cfg") there. Go back to the installation folder and paste "autoconfig.cfg" (from "Firefox_cfg") in, open it and edit the "newTabURL" to the file path of the index.html
Last active
January 3, 2022 14:28
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How to set a custom file as your Firefox New Tab
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