Firefox "stops responding messages" frequently + not sure what the plugins listed under updated ones as "unknown plugin" and " ?research "mean

hi there...
1) firefox has been giving me problems for several months where it just stops responding, meaning I click on one of the 5 tabs open then it gives me msg "firefox not responding", also happens when I am working with xsitepro website builder development software stops me from moving around the xsitepro program and firefox again says firefox not responding
Note: However, when firefox gives me "not responding msg" it responds after a few minutes and gives me access the tab i clicked on but then happens again when i try to click on another tab
2) went to a page that firefox listed plugins http://www.mozilla.com/en-US/plugincheck/ and there are several plugins listed that I do not know what it means below the ones it says it is updated, those are listed as " unknown plugin and ?research "
Not sure what does this mean as far as those plugins that are listed unknown and research. I did a search to see if I could find those plugins under addons but did not see them listed so are these plugins being used and installed on my firefox browswer and if so why are they hidden if they are installed or are they not installed at all
I did a copy and paste of the plugin check page so u can see what i see below:
The plugins listed below are up to date
Plugin Icon
Plugin Icon
Java(TM) Platform SE 6 U22
Next Generation Java Plug-in 1.6.0_22 for Mozilla browsers 1.6.0.22 Up to Date
Plugin Icon
Shockwave Flash
Shockwave Flash 10.1 r102 10.1.102.64 Up to Date
Plugin Icon
Java Deployment Toolkit 6.0.220.4
NPRuntime Script Plug-in Library for Java(TM) Deploy 1.6.0.22 Up to Date
Plugin Icon
Adobe Acrobat
Adobe PDF Plug-In For Firefox and Netscape "9.4.0" 9.4.0.195 Up to Date
Plugin Icon
Google Update
Google Update Unknown plugin Research
Plugin Icon
RealPlayer(tm) HTML5VideoShim Plug-In (32-bit)
RealPlayer(tm) HTML5VideoShim Plug-In Unknown plugin Research
Plugin Icon
RealJukebox NS Plugin
RealJukebox Netscape Plugin Unknown plugin Research
Plugin Icon
RealPlayer Version Plugin
6.0.12.775 Unknown plugin

Okay, that's a lot of information. I think the key part for support purposes is this:
''TheDrive [[#question-1057777|said]]''
<blockquote>
Just try yourself. Setup new profile and work a few days or weeks on any theme(s). Do not close tabs (at least ones, which you wanna explore once more). If your PC has 2-4Gb of RAM you will notice FF stopped to save session info after you will have a 50-100 tabs opened (you'll see sessionstore.js or session-backups\*.js script files reached 15-20-30MB long and stopped to change and it's LastMod date/time(s) are frozen) ...<br><br>
... I've noticed FF started to hang more and more and checked previous.js, recovery.bak, recovery.js was last modified on Apr, 14 but today is Apr, 16! I've lost one more hour trying to save tabs, even installed Session Manager, promised session saving on user demand but after a half hour of action against hanging FF, plugin showed me that I have NO ONE tab to save. I've managed to copy a few URLs to the text file before FF have completely fallen.</blockquote>
You're not the first person to report that the sessionstore.js or recovery.js file stopped updating with new activity. However, it's rare enough that I can't recall whether we have gotten to the bottom of it in a previous thread. I'll see whether I can search it up.
Meanwhile, someone might be able to come up with a way to watch for problems and extract some debug information, but I'm not personally familiar with such tools.

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