I gave this version a try, even downloaded the add-ons needed to emulate all the niceties available in Opera, but I ended going back to Opera...
What I didn't liked about Firefox:
- When I have many tabs open and I click on a new bookmark, instead of opening a new tab it loads in the actual one, and yes I configured the options accordingly (new pages should be opened in a new tab) it didnt worked at expected... Only workaround is pressing the scroll whell button to launch a new tab... WHY???
- When I closed firefox, all my tabs are closed by default, this is plain SILLY, luckily an add-on solved this
- Rearrange the toolbars, I could rearrange the bookmarks and the navigation bookmark, but I wanted to move the tabs toolbar above the navigation bar and I couldn't, looked for add ons and found none. I like the navbar to be the one at the bottom.
- go to url, in opera I select any word and I right button this function and it opens a new tab and goes to the page, if the selected word does not have .com it adds it automagically. Found an add on to do this but it was a 2 click solution instead of opera's 1
- mouse gestures, found and add on after looking a bit
So as you may notice at this point, almost all Opera functions are available as default or as add ons in firefox, but there are some User Interface details that IMHO need to be ironed out. I must say this is the firefox version I liked the most so far.
Pablo