You're my hero, finally I can ditch Firefox 56 which I kept just for the "Speed Dial by Josep del Rio" add-on.
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Now if you can get the thumbnail generation to work with JavaScript, have seperate "Sync every X minutes" options for each dial and have the same image offset and crop functions as del Rio's add-on, I won't have to look back to the good old days :D

Edit after response: Cool, thanks for the quick reply!
I didn't check the "Edit Dial" settings yesterday, they have everything I need (and more). Cool stuff!
Then I just have to wait for the new reload method for the sites that don't work (i.e. Outlook Webmail or Fastmail).

hello, very nice speeddial but,... for example if I want nice thumbnails with full width and without ads I must first set default zoom in browser and use slow "refresh by visiting page" option... please look at FVD they doing this in background with respecting browser settings like adblocker and web snapshot in thumbnails are big. But still this is great addon. Thanks

A very usefull add-on.
It could be great to have the choice to replace the preview with a simple text. Thanks for thinking about it.