for desktop user
- install firefox plug in "greademonkey" 
- open 乱码 page 
- click on plug in monkey icon on the plug in area on top of ur browser.
- select "new user script"
- paste following and close edit (save is automatic)

------------------------------------------------------------------
// for 'bbs.wforum.com/wmf/bbsviewer.php' only
if (location.href.includes('bbs.wforum.com/wmf/bbsviewer.php')) {
  
  
    var iHTML = document.body.innerHTML 

    iHTML = iHTML
        .replace(
              /<pre>/ig, 
              ''
            )
              .replace(
              /</pre>(?!.*</pre>)/s, ''
            )
        .replace(
              '&lt;!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"&gt;', ''
            )
        .replace(
              '&lt;html xmlns="https://www.w3.org/1999/xhtml"&gt;', ''
            )
        .replace(
              '&lt;head&gt;', ''
            )
        .replace(
              '&lt;/head&gt;', ''
            )
        .replace(
              '&amp;nbsp;', '&nbsp;'
            )
             .replace(/&lt;(.*?)&gt;/g, "<$1>")
  
    
  console.log(iHTML)
  
  document.body.innerHTML = iHTML
  
  
}