Not really. The extension removes all its observers when the blockage mode is disabled, resulting in minimal impact on your browsing experience and the usage of browser resources.
Is it possible to change the location of the toolbar button as I am not frequently using the extension?
Yes, read a Comprehensive Guide to Firefox Customization to find out how to change the toolbar button's position. If you are not using the extension too much, you can also try my the other extension to completely disabling this one when it is not neccessary, Add-on Manager with Profiler. Basically you can create multiple profiles and enable and disable certain extensions within a profile.
Why is the extension icon not visible in the incognito mode of the Chrome browser? Is this the expected behavior?
In Chromium-based browsers, extensions are not permitted in incognito mode by default. To enable the extension in private windows, you can navigate to the "chrome://extensions/" page, locate the extension and check the "Allow in incognito" option. Once enabled, the extension icon will become visible in incognito mode. The blocking feature will automatically activate when the private mode icon appears.
Please note that in the Firefox version of the extension, the exception list is only available if you are using the WebExtension version, which can be found here.
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I would recommend this add-on to everyone, especially people who are looking for an easier way to have control over websites.