Using Selenium IDE with Firefox 3.6
The current version of Selenium IDE (1.0.2) is ‘incompatible’ with Firefox 3.6 betas, as shown below.

There is a workaround or trick that you can use to get round this.
Warning!
It involves editing the configuration and settings of your Firefox browser, so be careful – you have been warned.
Step 1
In the address bar of Firefox, enter about:config

You will then be show a list of current settings and configuration.
Step 2
You will need to add a new Preference, called extensions.checkCompatibility.3.6b, which is done by right clicking on the list of preferences and selecting New then Boolean.

Enter the new preference (extensions.checkCompatibility.3.6b) then click OK.

You will now asked to choose a value – select false (to disable checking).

If you want to re-enable checking, you can simply use the Toggle feature (as shown on the right click context menu above) to switch between false and true.
Note:
Previous to 3.6 Beta 3, the generic property extensions.checkCompatibility was used, however it now uses specific versions 3.6b in this case.
Step 3
You will now need to restart Firefox for the changes to take place.
Step 4
If you view the Add-ons dialog, you will be warned that checking is disabled.

You will now be able to use Selenium IDE with Firefox 3.6
Note:
When an updated version of Selenium IDE is available, you should:
a) download and install the new version
b) re-enable compatibility checking.
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[...] and added a new Boolean setting: extensions.checkCompatibility.3.6b (false) as recommended here. Nothing seems to be working so [...]