slow opening of "SingleFile" addon saved pages

[rezad1393]

Describe the bug
when I save a page with this addon and then open it if firefox , it freezes (or severely slows) firefox for some seconds. but this only happens with some addons enabled.
I disabled addons to see which one cause it and found 4 which enabling any one would cause this behavior.

I noticed that having these addon enabled only wont produce the result but only disabling them fixes the issue.
these are those addons.
" https://addons.mozilla.org/en-US/firefox/addon/requestcontrol/
https://addons.mozilla.org/en-US/firefox/addon/privacy-pass/
https://addons.mozilla.org/en-US/firefox/addon/ipvfoo-pmarks/
https://addons.mozilla.org/en-US/firefox/addon/smartproxy/"

I also noticed with the help of this addon (https://addons.mozilla.org/en-US/firefox/addon/website-information/) that singlefile pages seem to tell firefox that they have bogus domains (I am not sure but the addon shows that)
like this
(https://user-images.githubusercontent.com/7523164/58860429-5a1a6480-86c1-11e9-9648-1cc37e6212b1.png)
I have reported this issue to smartproxy addon page (salarcode/SmartProxy#89) and I am also reporting it here to see what causes this.

opening the pages saved by singlefile in chromium doesn't cause this issue but in chrome I have less addons installed but have the smartproxy one install too.

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Expected behavior
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Environment

OS: archlinux
Browser: firefox 6.70.1
Version: latest

Additional context
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this is a bug reported here for singlefile addon and smartproxy addon and it also shows up when your addon installed.
can you fix it like smartproxy did?

salarcode/SmartProxy#89
gildas-lormeau/SingleFile#225