Looks fast and light, but no way to change the button images rules it out for me.

separator item in bookmarks toolbar menu isn't a bookmark, guys

Simple and comfortably! Well done!

It works great BUT...

https://support.mozilla.org/en-US/kb/permission-request-messages-firefox-extensions#w_access-your-data-for-all-websites

The extension can read the content of any web page you visit as well as data you enter into those web pages, such as usernames and passwords.

This is great. It uses firefox account to save all your speed dials.

Doen't show my bookmarks! Just another add-on with its one bookmark manager...

Best Speed/Fast-Dial addon, and I guess I tried 'em all over time.

This one relies on non-commercial, non-proprietary tech and is transparent because you can handle the bookmarks in the standard Firefox bookmarks view.

Thumbnail refresh is rather slow, but I this might be a limitation of webextensions (it has to load the whole page in a new tab first).

Let's hope this one keeps being maintained - I'd like a "dark theme" with plain dark background.

Need a quick, large and wide Up Button. I hope the author will default to the following flexible style:

#pages {
display: flex !important;
flex-direction: wrap;
flex-wrap: wrap;
}
#pages > * {
padding: 3px 15px;
}
#upbutton {
flex-basis: 100%;
order: 2;
text-align: center;
font-size: 1.5em;
padding-top: 15px;
background: rgba(0, 0, 0, 0.15);
}
.delimiter,
.customdelimiter {
display: none !important;
}

/* Other */
body {
background: #a7a7a7!important;
}
.imgcontainer {
border-radius: 0px 0px 10px 10px;
}
.container table tr td {
border-radius: 10px 10px 10px 10px;
}
div[type="remove"] {
border-radius: 0px 10px 0px 0px;
}

Just try it, there's a surprise.