Thanks for this guide.
I had some connection problems with lrcgenerator and looked for an alternative. So I discovered Karaoke Lyrics Editor, which is free for Linux and Windows.
I have already synchronized some lyrics with it and it works well so far. The only setting I disabled was “Stop at the end of the line”, so the cursor jumps to the next line when setting a time stamp.
A big advantage is that you can copy the synchronized lyrics directly from the editor without having to edit an exported .lrc file.
Edit:
I have problems with displaying the lyrics in a web browser and have created a bug report: