Everything (GUI, etc) is nice. Except that it seems like it's unable to sync across computer, right?

its really great if i can merge session, remove duplicate and many operation to clearing up and summarizing my session.... and i cant make storing size more than 99 sessioan?

It's good, IMHO the best session manager for Firefox, but the problem is, it just lost all the saved sessions for no apparent reason -- and no, I don't have other profiles, I just checked.
To be fair, most (all?) other session managers seem to do that from time to time, at least judging by user reviews. Perhaps it's more of a Firefox thing than this extension's fault, I don't really know. So it's four stars on trust because I don't know who's to blame.

I wonder how does one make automated backups outside of Firefox to work around this issue. Is it enough to copy the files under browser-extension-data/sessionboss@william.wong? Can they be safely copied while the extension is running, or is that looking for trouble? Or can the export be automated somehow?

Besides this, there's a minor UI annoyance: the buttons icons, which look right in the screenshots, for some reason look horrible here, as if they are being badly resized.

After closing Firefox I found a pop-up window from Microsoft was still open. Closing that saved it as my last session so I lost all my pinned tabs. Thanks to Session Boss, I was able to export the current session on my other PC then import it to this one. Everything has been recovered including favicons. Brilliant!

The only downside was that Firefox identified a couple of tabs as having errors and would not allow them to be restored.

I'm really pleased with this add-on! One big issue I noticed today, possibly related to the other review below me (luckily I exported a backup yesterday)... all of my user-saved sessions simply disappeared!

^^ I'm quite sure it happened right after I added a new container name to Mozilla's Multi-Account Containers.

I only see one feature missing than the other "big bosses" of the session management here and that is to support loading all the tabs "discarded" rather than lazy loading... It'd be so great to have an update to support this and also a big plus of it that other don't have that it's supporting tab containers... Please just add an option to load all the tabs "discarded". Thanks...

Looks promising (will update rating after more usage)

Please remove the Ctrl+Shift+S hotkey, because it's the default one for Firefox Screenshots.

Automatic save session every X minutes is a cool feature. Edit: but I would need a feature to not save a new session when it's exactly the same of the previous one.

Very useful, but I'd like a configuration option to allow access to private windows only for manually initiated captures, not the scheduled nor the on-change ones. Also, it shouldn't clobber those few scheduled and on-change captures with the useless "0 windows 0 tabs" ones when browsing in private mode. Being able to adjust the number of automatic saves kept wouldn't hurt.

Arguably the best session manager for Firefox. The only extra feature I would like to have is to connect to GitHub and save the session data in a repository.

Has great potential, look clean and modern. Might look complicated as first but it really isn't. The add-on can open into a pop-up or full page launcher. Can auto backup sessions. This session/tab manager is a mile ahead of all similar add-on on firefox.

Though, import URLs option is very limited. The add-on can only read it's own import format, which left migrate users in the dirt. User can't manual insert URL either.

No matter which restore function I use, only the very first tab is being restored and the rest are being ignored. It looks like a great addon but it simply doesn't do it's job. For now, this addon serves me as a backup list of my tabs for when Firefox's sessions restore fails. Firefox Stable v66.

-- EDIT -----------------------------------

Cant seem to reply to the response so I'm editing my review:
No difference. After some investigation, it seems that there must be a Firefox preference (perhaps via my user.js file) that is set causing the "bug" (disabling all addons did not help). Debugging this would require moving user.js elsewhere out of the profile directory, then opening Firefox and going through about:config, manually resetting all modified preferences: not ideal. Any idea which preferences you addon relies upon to be functional (and note them on the addon's page)?

When using this addon with a new profile, it works as intended.

Good, but consistently seems to restore windows in the wrong order, which really messes up my workflow.

The most feature rich session manager for Firefox Quantum that comes closer than any other for replicating the old, brilliant-but-defunct Session Manager extension.

Missing but sorely desired is some way to synchronize sessions between Firefox instances. Other session managers do this by storing sessions in bookmarks. Session Boss does not use bookmarks.

Also highly desired is a method to export sessions in a way that can be easily imported - either as a bookmark file to use outside of the addon, or a file that can be easily imported into another instance of Session Boss.

Feature requests: 1) Pin sessions to the top of the list. 2) More than 99 sessions slots please.

Overall, a very good stab at providing a much-desired feature but a couple of things I would like are missing.

Its over-complicated, but it actually works, and preserves tab order.

It is quite good.

Quite good, but deleting scheduled and on-change bachup by user is a "must have" feature!!!

Looks very good. Unfortunately, it does not cooperate well with TreeStyleTab addon. In particular, it does not restore the tree hierarchy. At least it leaves the tabs in the original order. :-)

It does the job, but the interface is a bit overwhelming. I recommend the developer take a look at the Session Buddy extension for Chrome, and see how much simple and more intuitive something like this can be.

And maybe it's just me, but I wish there were a way for it _not_ to keep lists of automatic session backups, or at least to limit them to a certain number. The only reason I'd want automatic backups is if the browser crashed and I lost a bunch of open tabs---and in that case, all I'd want to do was restore the single, most recent session. It just seems like overkill to have long lists of them whether you want them or not. Thanks!

I already gave praise to this plugin, and I still like it, however, I'd like to report couple of things:
• [major] I'm joining other users to report that restored tabs sometimes just go to (seemingly) random URL (some other tab), and the history is lost for that tab. It is really annoying!
• [minor] Using TreeStyleTab, upon restoring session, the parent tab is transformed in a sort of an empty "folder" tab which is like a placeholder for its children tabs. I don't mind this much, but it's unusual.
• [minor] Using https://github.com/nyordanov/panorama to group tabs, the restored session will restore tabs as if they were in a single group.
Otherwise, thank you for your hard work on this extension!

Needs Tab Navigation information saved into the session store, as stated is a goal. Sooner, better!
GUI needs tab maintenance feature. Says it has it, but I don't see ability to add, remove tabs from sessions. This might be due to my difficulty seeing everything in the GUI. Titlebars, toolbars are unusable because I can't click on everything.
Thank God for default Tree View! Tab Session Manager doesn't have that.
Great, great work replacing SessionManager by Kraft.
On my wishlist: SessionManager had a WYSIWYG GUI with drag-and-drop, resizing, wow can that still be done?