The various threads I've come across are difficult to fully comprehend.
The latest version I'm using now is 2.35 but those systems are all XP Pro SP3.
OS Win7 Pro 32bit:
I'm looking to install (in spite of not being able to sync other system's Sent folders and unable to implement IMAP yet).
Our ISP's webmail is the worst I've ever come across in over 3 decades of doing this. It's absolutely horrendous.
Tested 2.49.3 but had nightmares with add-ons.
I don't think the following is over the top compared to what I've seen others have:
ublock origin
umatrix
Greasemonkey
Image Zoom & NoSquint* (yup, eyes not what they used to be)
* Not sure if it's necessary with ctrl + & - ability. But always liked to manage control with NoSquint.
Self Destructing Cookies
Speed Dial (Josep del Rio) best one I've used yet
RefControl or something as good or better
Close tab with double click or something similar
User Agent Switcher or similar (but that's not as effective as it once was)
NoScript (not mandatory but always liked it and never had problems).
On almost every one of these it claims 'only for Firefox' and stopped me cold.
Tried various tricks to hide it was SM (manual UA etc.) but nothing worked.
DL'ing the *.xpi, drag & dropping failed as well. Even older versions!
Heck, I used to be able to edit the .rdf file and life was good. Is that not the case anymore?
](./images/smilies/eusa_wall.gif)
----------------------------------------------------------
With our Esteemed 'therube' appearing not to like AMO, I'm left at the mercy of those [much more adept at this newer version] **
who can help. ** Which is no doubt everyone else on these Amazing forums.

Until I can sort out whether or not I can install any add-ons, I'm not able to install the above referenced version.
As always I can't thank you enough for any help.