For funding future development and maintenance of the QuickFolders Add-on and distributing the load from a few "Pro Users" I will implement a three tier system going forward from Thunderbird 91, until QF is completely ported to a web extension and finally maintenance free.
- Pro License: no change, an annual license giving the extra features outlined at the support site.
- Standard License: Support the current feature set without additional restrictions. I also intend to remove the warning about quickMove / quickJump being a "Pro feature" so there will be less disruption during daily work with these important functions.
- Unfunded version: at the moment I am considering how to slightly restrict the feature set for beginners and casual users. One thing I definitely plan is restricting the number of tabs to a number e.g. up to 12 tabs. The choice of "unfunded" as opposed to "free" will highlight the difference as QF is still an open source, user-modifyable piece of software. The only restriction to prtoect my investment is that of using the CC BY-ND 4.0 license which prohibits building competing products from my work (No Derivatives) but allows adapting it to your own personal needs.
Transition Phase to 3-tier model
The hard thing will be the transition phase, I want to tie this to using Thunderbird 91 forward.
License Messages
The wording of the "x is a premium feature" will be modified for the functions that are now also available to standard users:

Suggested new wording: "x" is a feature that is supported through licenses, if you find this useful you can get a standard license or a Pro license for extended features"
The QF Pro licensing screen will have to be modified too and be made more flexible, similar to SmartTemplates.
- if the user has a standard license (and it is not close to expiry)

- if the license is close to expiry (currently within 30 days in SmartTemplates)

so there is always a choice for upgrading at the same time as extending the license.
the file "license.txt" needs to be updated to reflect of the existence of the new Standard license.
Additional Features in Standard License
The following features will be opened to standard license users (and not just be restricted to Pro Licensees)
- Backup/Restore:
[Load Configuration...] will be unlocked for Standard Li.cense. When clicking [Save Configuration...] wording must be changed to "you can backup your configuration now but will need at least a QF standard license to use the loading feature". The user can always use the copy tabs / paste tabs functions on the Advanced tab if they need to transfer a setup to a different machine / profile.
- Tab specific properties / Advanced Properties. Some of the features on this page should be restricted to "free version" users:

which ones?
- Skip folder button: this is kind of an advanced feature but it is also very important. The Pro version also adds the configurable shortcut, which is going to remain. Should Skip be disabled in the "unfunded version" or should I add a sliding notification and let the unfunded version keep using it?
- Reading List: as this is an expensive feature to maintain it will be restricted to 6 entries for "free as in beer" users. This way it can still be evaluated and tested.
- Number of QuickFolders tabs - this should be restricted in the "unfunded version" as the most visible way and incentive to obtain a license. My initial idea is having a maximum of 12 working tabs for that. If an existing user has more tabs, they should see the excess tabs as disabled or somehow marked and they shouldn't be able to add more tabs (or those tabs could be disabled for clicking, but still available as information). Not quite sure how to pull this off in the transition phase as I expect some pushback, and no doubt there will be bad reviews following this move. So the question is how to do this in a compelling manner without disrupting a user's workflow too much.
Pricing, Periodicity
My initial price will be €5 / $5 for the first year and then €4 / $4 on renewals / extensions. I am still considering a permanent license but again it won't make sense unless QuickFolders is fully converted. On the one hand it is important and obviously rewarding to earn money and be invested into this project and it is certainly unreasonable to expect this to work (and be supported) forever with such a currently volatile and constantly evolving platform as Thunderbird / Mozilla (they increased the release rhythm to a new minor version push every 4 instead of 6 weeks), but on the other I hand I acknowledge that it's not ideal to "hire" software when we could own it.
As the license validation currently has a expiry date "baked in" I might offer a higher priced life-time license that could be set forward to 70 years (I am somewhat doubtful of Thunderbird or maybe even desktop PCs even existing at that stage), which could be 5 times the price of a standard license, likewise we could have this with a Pro license. Let's discuss.
For funding future development and maintenance of the QuickFolders Add-on and distributing the load from a few "Pro Users" I will implement a three tier system going forward from Thunderbird 91, until QF is completely ported to a web extension and finally maintenance free.
Transition Phase to 3-tier model
The hard thing will be the transition phase, I want to tie this to using Thunderbird 91 forward.
License Messages

The wording of the "x is a premium feature" will be modified for the functions that are now also available to standard users:
Suggested new wording: "x" is a feature that is supported through licenses, if you find this useful you can get a standard license or a Pro license for extended features"
The QF Pro licensing screen will have to be modified too and be made more flexible, similar to SmartTemplates.
so there is always a choice for upgrading at the same time as extending the license.
the file "license.txt" needs to be updated to reflect of the existence of the new Standard license.
Additional Features in Standard License
The following features will be opened to standard license users (and not just be restricted to Pro Licensees)
[Load Configuration...] will be unlocked for Standard Li.cense. When clicking [Save Configuration...] wording must be changed to "you can backup your configuration now but will need at least a QF standard license to use the loading feature". The user can always use the copy tabs / paste tabs functions on the Advanced tab if they need to transfer a setup to a different machine / profile.
which ones?
Pricing, Periodicity
My initial price will be €5 / $5 for the first year and then €4 / $4 on renewals / extensions. I am still considering a permanent license but again it won't make sense unless QuickFolders is fully converted. On the one hand it is important and obviously rewarding to earn money and be invested into this project and it is certainly unreasonable to expect this to work (and be supported) forever with such a currently volatile and constantly evolving platform as Thunderbird / Mozilla (they increased the release rhythm to a new minor version push every 4 instead of 6 weeks), but on the other I hand I acknowledge that it's not ideal to "hire" software when we could own it.
As the license validation currently has a expiry date "baked in" I might offer a higher priced life-time license that could be set forward to 70 years (I am somewhat doubtful of Thunderbird or maybe even desktop PCs even existing at that stage), which could be 5 times the price of a standard license, likewise we could have this with a Pro license. Let's discuss.