Open a set of bookmarks as tabs on browser startup by simply selecting a bookmark folder which contains them. Short Demo Video: https://user-images.githubusercontent.com/67047467/223754810-f4c0032f-0667-4739-9205-9bb0106f288e.mp4 Usage:

click the toolbar icon
select a startup folder
(optional) choose if opened in a new window (with prefix)
(optional) append "#pin" to bookmark urls to open them pinned
click the Test button to make sure its how you want it :-)

Notes:

Can/Should i trust this addon? You can view the source code by either visiting the Homepage/Support Site or just saving/downloading the XPI (which is really just a ZIP Archive) and then extract it locally. The Sources in the XPI should be unofuscated and unminified (HTML,CSS and JS), so it's as easy to read as possible. Alternatives you can also use the CRX Viewer Extension by Rob W to inspect the XPI sources. If you have an questions, you can also open an issue on the support site and i'll try and answer to the best of my abilities. If you are no programmer and are still feeling unsure, you might want to visit one of the official or unoffical mozilla communities and ask if someone there with more knowlege can take a look. Examples: https://reddit.com/r/firefox , https://lemmy.world/c/firefox or https://chat.mozilla.org/#/room/#addons:mozilla.org
Permissions: This add-on tries to use the minimal number of required permissions to successfully fullfill its intended purpose. If you think this could be improved please let me know by opening an issue and i will try to look into it. More Details on the individual permission can be found here: https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/manifest.json/permissions
Cost/Payment: This Add-on is and forever will be subscription and payment free to use for everyone however they like. If you are feeling generous you can send me a tip via my bitcoin address 35WK2GqZHPutywCdbHKa9BQ52GND3Pd6h4
Stars/Reviews: If you found this add-on useful leave some stars or a review so others have an easier time finding it.
Bugs, Suggestions or Requests: If you have any issues (for example a site it does not work but you think it should) or have improvement suggestions or a feature request please open an issue at the Support Site

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