# sIFR Documentation and FAQ
Changelog

Updates from 2.0 to 2.0.1:

- Fixed a regression where the elements wouldn't be replaced in Mozilla 1.4 when the replacement statements were located in the `head`.
- Tweaked the Rollback Add-on because it didn't remove elements added by Flash blockers (such as AdBlock).

Updates from RC4 to 2.0:

- If you are using `html.sIFR-hasFlash` for your decoy styles, you have to change this to `.sIFR-hasFlash`.
- Added debug functionality
- Added a way to stop the hiding of browser text until replacement
- Working again in IE/Win 5.0
- Fixed selector bug in Opera 7.5x in XHTML mode
- Added support for comma seperated selectors.
- Tweaks and bugfixes for Safari 1.3.

Important updates from RC3 to RC4 are:

- By default sIFR is disabled for IE/Mac. You can enable it again by removing the check at the bottom of `sifr.js`.
- You need to test if sIFR is a function.

Other updates from RC3 to RC4 are:

- Better selector support
- Better tweaking for transparency support
- Workaround for the Fragment Identifier Bug
- Better KHTML support
- Various other bugfixes