Preparing everything

Execute prepare.sh and you'll have all set

To update the bookmarks use sudo sed -i 's@^BOOKMARKS.*"@BOOKMARKS="'"${BOOKMARKS}"'"@' /usr/bin/

Building chromium extension

To build the chromium extension is through the Pack extension option in the Extension options

Building firefox extension

To build the firefox extension is enough with compressing the bookmark-bridge folder into an xpi file

cd bookmark-bridge && 7z a ../bookmark-bridge.xpi * -r

Notes

This extension requires python-is-python3 and the python library watchdog >= 2 to work properly

Relevant paths

FF_NATIVE_HOST="/usr/lib/mozilla/native-messaging-hosts"
FF_EXT_PATH="/usr/lib/firefox-esr/distribution/extensions"
CHROME_NATIVE_HOST="/etc/opt/chrome/native-messaging-hosts"
CHROME_EXT_PATH="/opt/google/chrome/extensions"
CHROMIUM_NATIVE_HOST="/etc/chromium/native-messaging-hosts"
CHROMIUM_EXT_PATH="/usr/share/chromium/extensions"