SingleFile Companion

SingleFile Companion is a program that runs outside the browser. It can:

make the saving process more transparent when the auto-save is active in SingleFile,
auto-save pages in an anonymous session in a separate browser,
save pages in another directory than the download directory.

It is recommended to use SingleFile Companion Lite if you only want to save pages in a directory other than the download directory.

It uses the Native Messaging API to communicate with SingleFile.

Install

Install Node.js
Install jq, the JSON processor
Download the SingleFile Companion project zip file and unzip it somewhere on your disk.
Run npm install in the root folder where you unzipped SingleFile Companion.
Go into the subfolder corresponding to your OS and your browser. For example, if you use Chome on Linux:

cd companion

cd linux

cd chrome

chmod +x install.sh

./install.sh (Linux/Unix/BSD etc.)

install.bat (Windows)

Enable the option Destination > save with SingleFile Companion or Auto-save > save the page with SingleFile Companion in SingleFile

The options.json file allows configuring SingleFile Companion. Here are the entries you can edit:

savePath: path where to save files (default: SingleFile/companion path) These options are also available when the option Auto-save > save the page with SingleFile Companion is enabled:
backEnd: backend used to save the page (default: "puppeteer")
errorFile: path of the file where errors are stored (default: undefined)
browserHeadless: whether the browser is launched in headless mode (default: true)
browserDebug: whether the browser is launched with the developer tools opened (default: false)