X-notifier 3.x for Firefox (deprecated)

Willing to activate multiprocess function in my firefox but i was blocked by
addon x-notifier 3.5.23 ( i'm a heavily user of it) wich is not compatible with multiprocess

I'm trying to install 
https://addons.mozilla.org/en-US/firefox/addon/xnotifier-neo/

This add-on has not been reviewed by Mozilla ... yet ..

and when i try to install it on  FF v48.0.2 (euroballot-1.1)   it says : "addon corrupt"

Any clue to use multiprocess and xnotifier in FF ?

What do the check boxes for "X-notifier window" and "X-notifier sidebar" do? I don't noticed any differences whether checked or not. But I'm using Pale Moon, so maybe they don't work correctly with it.

Does the new X-Notifier support the POP3/IMAP scripts?

Today both Chrome and Opera browsers updated to 3.5.23 but Firefox prevents installation since the new iteration is not yet 'authorized'. I complained to them through feedback: this is the opposite of a security feature by delaying improvements to an add on provided by a trusted source.. Perhaps more complaints would soften their resolve to persist with their sludgy process for reviewing add on updates.

I had my entire X-notifier database wiped clean on an update of Firefox v48.0.1 last night (24 August 2016).   

When I elected to install the new Firefox update I was presented a window asking IF, I wanted to ( I do not remember the exact wording) erase, eliminate, rebuild .. however it was worded, it worried me.  I did not want to lose my very long list of emails in my database!!  The only option was to accept or Cancel Install.  I cancelled then set about looking to see if there was a comment - somewhere -anywhere!! - about this issue. I foun nothing.  

Having just set up the Firefox Sync, I assumed (mistake #1) that since I was Synced, if I had the databased wiped out on one computer, the other, when synced would rebuild the database.  Well, it did NOT do so.  

Hence RULE #1, backup your X-notifer database - by EXPORTING your X-notifier data out to a file on your computer.  That is good computer management any way.  But it does not answer the question, "Why did the Firefox update erase my X-notifier data?"

So, I am not sure if the X-notifier wipe-out was due to Firefox update, Sync or X-notifier not being on the up-tick with Firefox update.  Too many variables to be sure which is the culprit .. or not.

But obviously, something does seem to be amiss with the Firefox/X-notifier interface.  We who use X-notifier MANY TIMES each day, certainly hope this is remedied quickly.  

Anyone care to offer ideas or answers (preferably) to the Topic?

Thank you  -  net500cg

I've been checking six Gmail, five Yahoo!, and one Hotmail account for years. For some weeks now, X-notifier will "not check" one or several randomly. Forcing a 'check now' may or may not check the missed email account as will the next cycle, or reloading the browser.

Firefox version 45.2.0
X-notifier versio 3.5.21

Removed and cleared cache and cookies a number of times, reinstall and re-add accounts, same thing, NOT CHECKED.

Help?

Anyone know if theres a half decent alternative to x-notifier please?  We're getting a bit fed-up now checking

back every day for script updates.  It gets a bit laborious when each login script goes down and you have to wait months

for updates.

In older versions, there was a button/icon you could add to your main toolbar and see X-notifier.  I am only seeing the status bar icon and it's not displaying when I go to Menu > Customize.  Where is the X-notifier icon?

This is on a new Firefox install with default settings and this add-on installed.  What happened to it?

New X-Notifier Box version 3.5.21

It's SO BIG!  And is there any way we can control how long it takes for it to close?