sombat said

but when open file that saved it has fade hidden

What do you mean by this? How are you trying to save the web address?

Email a link from Firefox (Send URL in message) {web link}

ex. this web https://www.youtube.com/watch?v=Tp2FRiGESLs

but if I save as "web page  complete" it fade out when open file as attach file

 http://www.mediafire.com/file/le9cod58l9heqbz/VID_20180702_084230.mp4/file

 if save general webpage it can save (File >save page as webpage complete )  ex.

https://today.line.me/th/pc/article/How+to+4+%E0%B8%A7%E0%B8%B4%E0%B8%98%E0%B8%B5%E0%B9%80%E0%B8%8B%E0%B8%9F%E0%B8%AB%E0%B8%99%E0%B9%89%E0%B8%B2%E0%B9%80%E0%B8%A7%E0%B9%87%E0%B8%9A%E0%B8%9A%E0%B8%99%E0%B8%A1%E0%B8%B7%E0%B8%AD%E0%B8%96%E0%B8%B7%E0%B8%AD+%E0%B9%80%E0%B8%81%E0%B9%87%E0%B8%9A%E0%B9%84%E0%B8%A7%E0%B9%89%E0%B8%AD%E0%B9%88%E0%B8%B2%E0%B8%99%E0%B8%97%E0%B8%B5%E0%B8%AB%E0%B8%A5%E0%B8%B1%E0%B8%87-50M1Ny
  
   please considerable thank you.

I went to the link and save the page and nothing happened or faded out. What do you mean attached file?

Thank you for answer .when i want to save page of youtube. ex. this web

 https://www.youtube.com/watch?v=Tp2FRiGESLs

And i like many songs then I want to save page as "xxxxx "  for on desk top. for open on next day. when i save it ready .when i open it again it appear this  
    http://www.mediafire.com/file/le9cod58l9heqbz/VID_20180702_084230.mp4/file

It appear fade out to hidden blank.  But when i save page as by google chrome it can save .
 
https://www.mediafire.com/file/hukxzlrflbmb9kn/2.mp4

  * I save page as" "    webpage complete. 
                                                                                               thank you.