Please do not use Session Sync for auto history saving. It's not something that it's guaranteed and it's even in the description of the addon on the first line with bold. It's just a feature that is most of good enough but not something that is perfect.

THIS ADDON IS NOT INTENDED FOR AUTO-SAVING OF SESSIONS!

As for saving sessions manually, those sessions are stored into bookmarks so it should be impossible to lose them unless the whole Firefox profile is broken in which case is not the addon fault.

Hi. I'm sorry that you consider this a bad experience but please understand that your context is way outside of a normal user situation. The addon just tries to save the data into storage and I have no way of configuring how and where that storage goes, it's what the API provides. As regarding the configuration, you have the option to not use the saving at all (disable) or you have the option to change the interval of the saves, there is not really anything left to do, and the timing was set to 15 seconds because most users have a few tabs opened and saving them will not require substantial IO or storage. In your case yes it does not makes sense but that's why you have the options to change. The storage space is just made up of the URL and title of the addon and the icon of the site nothing more, so there's no real overhead that I create other than what it is required for a session.

Please also not that the addon description clearly states that "THIS ADDON IS NOT INTENDED FOR AUTO-SAVING OF SESSIONS!".
Having this in mind, giving a 1 star rating to something that is not intended for your own purposes and in that context of having hundreds of tabs it's a little bit excessive.

Hi. Thanks for the review. Seems that you're not the only one that has this problem. Sadly I don't think there's a solution for it because it doesn't seem to be a problem created by the code from the addon but most probably after a Firefox Update.
See this thread for more info: https://github.com/ReDEnergy/SessionSync/issues/103

As much as I hate the issue, I can't really implement a solution for it because there is nothing wrong with the addon itself. If you try and open the addon view inside the Windows Mode or the Tab Mode you will see that the scrolling works just fine. The issue is related to the Firefox profile you have I believe. Sadly it seems that Firefox updates constantly keep corrupting (for various people) the profile. This might also be a problem created by the same issue. I understand your frustration but there's literately nothing I can do, if the same code works in Tab Mode / Window mode (CTRL + SHIFT + V or CTRL + SHIFT + U) then it means that Firefox somehow broke the Panel mode (and it's not reporting right the information inside). If you would install the addon on a clean profile you will see that everything works as expected.

Thanks for point it out, but unless I can somehow find the issue and investigate more about it, there's nothing I can do. Again, looks like is not a problem of the addon, but I might be able to somehow do things differently to avoid this Issue I will try.

Hope you take the time to read the response.

Regarding the bugs and problems that I reported as being solved, most probably I did that because I genuinely thought that I fix them. If they are not fixed or other issues appear after a while that's something different. Please consider that Firefox nowadays makes so many updates that simply you can't control. Addon developers have 0 control over what Firefox is nowadays and everything is designed for the rest of the users... that basically may have 1-2 addon or non at all installed... and power users have been left behind somehow simply because they don't matter in the grant scheme. Now I'm not saying that things are intentionally, but all these constant updates can brake stuff... make addons resets internal settings, disable them, and so many similar things. When this happen the addon developer have done nothing wrong but most of the users blame addon developers for these kind of errors as well.

Now I'm not saying that addons are clean and there are no bugs in them. Clearly is not the case.
In my case, I know that there are some issues, but was not really able to figure them out, when and why they happen. That doesn't mean that I'm right and a particular user is wrong and the addon is perfectly fine. Not at all... it just mean that I might have a very hard time finding the actual cause of the issues.
I have several of those like it's the one your describing above:
For example certain settings may make the restoring functionality to restore everything in reverse order. I can see that, and that's why I added an option to reverse the restoring of tabs. What I can't really get to reproduce is why you say they are scrambled. I simply can't make this happen... Trust me I'm really trying, I have really no idea why and how to do that. If I could understand where it's happening I can find the root cause and fix it. But in programming usually if you're not able to reproduce something is extremely hard to fix it. I look over the code again and again and things seems fine. My only concern is not to be something internally in Firefox that somehow when I tell him... please restore 1, 2, 3 he reorders them somehow into whatever else. But I can't tell if that's true or not because I can't reproduce it. Really really sorry about it.

The addon is unmaintained and out of date. I understand why you say that but it's not really true. I care about the addon a lot, but I simply considered that most of the functionality is solid enough and things work as they are suppose to. I do have a few issues reported, and lots of features requested, but imagine that working on them it's not 1-2 hours. I'm not a bad programmer and I can work pretty fast... but things can take a lot of time. New features need to be tested well before releasing them so I have to take into consideration that. Now, here's the problem, in the last few years I simply had very little time to invest into this addon (because life). I hope you understand that getting 1, 5, 10 $ through donation (once in a while... which I mean months), it's only as a form of thank you from some people that are really happy with the product and that in reality they really can't help you invest more time into developing the addon. Free open source addons don't help you live from a month to another... so as anyone around me that has to provide for themselves, I had to prioritize my job, other projects and so on, you know things that would actually... buy you food or whatever else you may dream of (even if that's not essential). And I think that it's perfectly fine.

Sadly, I have around 2-3 updates that were kind of ready, but are only available on Github, and I was not able to release them simply because I did have time to test the new features thoroughly.

It's the addon perfect. No not at all. Does it have issues. Seems so, but depends a lot on what you do. In my case it's a core part of my daily browser experience and it's really hard for me to live without it. I use it a lot. And it does the job perfectly without any errors for years. But at the same time I don't use all the features, I rarely restore full sessions and most of the time I interact with very few of the links and save new ones and so on. But when I do restore some sessions I have not seen errors (myself again... can' tell anything about anyone else)

Is the addon out of date. I personally don't think. There are many new people that try it and they like it and for them it's really useful. So it's always based on our personal experience with thinks. I just hope that with time when I will be able to finally make a serious update to it, I will fix as many things as possible that people have been reporting lately. Also... think about it... If I have not updated it... what exactly went wrong if issues started to pop-out in the last period. Most probably Firefox did something internally with an update that may have broke something from the addon. As addon developers, we simply can't put up with that. Having so many updates that may break things and us constantly be ready to fix things when it happens :D.

I may have a different view on this than others, but I put here the addon in the hope that it would help others as much as it helps me from day to day. It's not perfect, it's not good for everyone, but it's an option for those that find it useful.

Lastly, nothing I said above it's an excuse for your bad experience with the addon. I just stated some facts as I see them. I'm sorry about all the issues that you had and just so you know I will definitely try to fix things when I know exactly what goes wrong. Right now, trust me, I really have no clue. If you can give me any hint, concrete example that I can reproduce, that would be perfect and I might be able to fix it.

Thanks for using the addon for as long as you did, have a nice day.

Favicon request code was removed (as of version 3.0.3). No single request is created from within the addon toward a third-party server. Favicons are directly taken from the sites that you visit (so each favicon from it's respective site and cached locally if possible).

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Hi. I care really a lot about privacy and I really messed up this. Since there was no way around to get links favicons using WebExtensions I looked up for alternatives and I found that google has a service for this. I'm really really sorry about this. When I read your message I literately stopped for 2 seconds realizing how idiot I've been that I thought this is an alternative solution. Really really sorry for doing this. And no, of course I'm not paid by google. I simply made a stupid decision without realizing that service may be tracked by google.
I really understand your concern and it's totally right.
Again.. really really sorry. The code will be removed right away. I will update the message as soon as I fix this.