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About this Add-on
- Information comes from both the DNS entries of the servers contacted to load page elements and from the connections Firefox makes to those servers - providing the most complete information possible.
- The icon can be shown either in the address bar or as a toolbar button (which can be customized to many locations in the Firefox interface).
- This addon does not consult with any external service to determine your own IP address, avoiding any privacy concerns arising from such behaviour. Sixornot makes use of your OS's native DNS resolution capability which permits a more accurate assessment of your IPv4/IPv6 connectivity.
- By looking at both the DNS entries for a domain and the IP version used to make connections to it Sixornot can see when you are connecting via IPv4, but the remote site has the capability to be contacted via IPv6 - useful for those interested in whether sites are IPv6-capable but are not on an IPv6 connection themselves.
- DNS and IP address information can be copied to the clipboard by clicking on entries.
- Version 2 adds information about security (TLS status) for all the servers contacted in loading a page, along with more detailed information about whether connections used a proxy
E10S: SixOrNot should be fully working with multiprocess Firefox, please do let me know if anything seems broken.
A note about WebExtensions. Currently Mozilla plans to disable all non-WebExtensions addons in November 2017 with Firefox 57. At this point SixOrNot 2 will cease to function. I'm really disappointed in the direction Mozilla has decided to take Firefox in - turning the amazingly powerful and complex addons ecosystem into a Chrome "also ran" is just sad. Currently WebExtensions doesn't support DNS queries, per-request proxy information or per-request TLS information. There's a bug opened to request support for TLS info, and I've opened bugs asking for support for DNS/proxy information.
If a way to perform DNS queries isn't added then I don't see much of a future for SixOrNot under WebExtensions. The key selling point of my addon is that it does that bit more than addons like IPvfoo, in that it checks to see if you could have connected over IPv6 even if you didn't. Without the ability to perform DNS queries this just isn't possible (at least not without using some kind of external DNS webservice, which is a huge privacy concern). I also personally don't see Firefox surviving once the only real differentiator it has over Chrome vanishes.
After putting a huge amount of work into rewriting SixOrNot to be compatible with Electrolysis (multi-process Firefox), which hasn't yet really seen much use it's rather galling to be told by Mozilla that my work is "legacy", and that I have to migrate to using an API which provides little of the functionality needed to deliver features that have existed in my addon for years.
I hope to be able to continue to develop and maintain SixOrNot but at the present time I suspect it's likely not to survive past November. We'll see what happens with the bugs I guess.