One sites constantly let Firefox almost crash: this page will not start en I have to close firefox. When I restart Firefox the problem start immeediately

for example this page (http://www.klop.nl/kloppenframeset.htm?kloppen000082.htm#8267) starts the problem: Firefox doesn't resond at all. I close Firefox wih "Taakbeheer" and when I start Firefox again all the opened windows pop-up again and the problem is the same.
After about 5 minutes I can close the windows normaly.
After I opend a few windows in 'Bachground-processes' you can see that there are at least 3 Firefox-programms running

Works for me on Linux with the current release.
I see a lot of these warnings in the Web Console (Firefox/Tools > Web Developer) about using document.write.
<pre><nowiki>An unbalanced tree was written using document.write() causing data from the network to be reparsed. For more information https://developer.mozilla.org/en/Optimizing_Your_Pages_for_Speculative_Parsing</nowiki></pre>
I don't know if that would contribute to your issue.
The entire page source seems to be created via JavaScript:
<pre><nowiki>$mainframedoel=parent.location.search.substring(1) + location.hash;
document.write(
'<frameset rows="130,*" frameborder="NO" border="0" framespacing="0" cols="*">'+
' <frame name="topframe" scrolling="NO" src="kloppentopframe.htm" >'+
' <frameset cols="180,*" frameborder="NO" border="0" framespacing="0" rows="*">'+
' <frameset rows="180,*" frameborder="NO" border="0" framespacing="0">'+
' <frame name="lefttopframe" scrolling="AUTO" src="kloppenlefttopframe.htm" >'+
' <frame name="leftframe" scrolling="AUTO" src="kloppenleftframe.htm">'+
' </frameset>'+
' <frame name="mainframe" src="'+
$mainframedoel +'">'+
' </frameset>'+
'</frameset>')</nowiki></pre>
Clear the cache and remove cookies only from websites that cause problems.
"Clear the Cache":
*Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"
"Remove Cookies" from sites causing problems:
*Firefox/Tools > Options > Privacy > "Use custom settings for history" > Cookies: "Show Cookies"
Start Firefox in <u>[[Safe Mode|Safe Mode]]</u> to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.
*Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
*Do NOT click the Reset button on the Safe Mode start window
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

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