i have followed process for importing bookmarks from chrome but at end the 'from google chrome' folder is empty https://support.mozilla.org/en-US/kb/import-book
all info in the question title
See if this works;
Have Chrome save the bookmark as an HTML file. Then,
To open the Bookmarks Manager, press the Alt or F10 key bring up the tool bar, and select Bookmarks. Hot key is <Control>(Mac=<Command>) <Shift> B.
Once the window is open, at the top of the page, press the button labeled Import and Backup. Select Export Bookmarks To HTML, and follow the prompts and save it to a HTML file. Copy the file to another computer. Repeat the instructions above, BUT select Import Bookmarks From HTML,