Hello there :)

As an author of GroupSpeedDial I can guarantee you there are no passwords or any other private data being collected.
In fact, unless you create an account on https://group-speed-dial.fastaddons.com/ there will be no data send to my server at all.
If you create an account, only information about dials you entered (like URL and name) will be synchronized with server.

All this can be verified by anyone using Developer tools in Firefox and checking network messages.

Also all add-ons including this one has to pass automatic and manual tests/reviews done by FIrefox team to avoid malicious add-ons.

Regarding the message about accessing all data - this means that add-on can inject "content script" into some pages - specifically this add-on can inject it only in my "https://*.fastaddons.com/*"" domain, this can be verified in manifest.json file.

I would like to point out that privacy is very important to me and I'm doing my best to protect all users data synchronized to my server. These data will be never accessible to anyone else!

Regarding your issue with the "blank page", could you please write me to my support e-mail your Firefox version and operating system you are using? Add-on should work normally in every OS in every new Firefox version including Nightly.

Have a nice day and weekend :)

Best regards,

Juraj Mäsiar