https://adguard.com/en/blog/big-star-labs-spyware.html
Reported for abuse

totally useless

Sells user data

Wo bitte liegt da der Sinn, man kann Websites mit der Adresse sperren lassen oder durch einzelne Wörter. Soweit so gut, das man das ganze auch noch durch ein Passwort schützen kann ist genial, die Einfachheit würde auch schon 5 Sterne verdienen. Aber das ich einfach das oder den Addon problemlos im Firefox Menü deaktivieren kann. Ist wirklich ein Schildbürgerstreich, sorry, aber da fragt man sich wirklich wie weltfremd Programmierer sind. Auf die Idee einfach bei den Addons nachzusehen kommt wirklich jeder Teenager, gut gemeint, ich bin weder versiert noch ein Teenager, aber bei das Addon einfach deaktivieren,hatte ich auch einfach gemacht. Ein völlig sinnloses Addon

Bad performance on top of privacy concerns

aside from info i found after downloading about info selling (which i do not know the validity of). i put a site in my blocklist. i then realized i could change it to be a whitelist. so i remove the items in the blocklist, add some sites to the whitelist, and then switch tabs to find the whitelisted site is blocked for not being on the whitelist. ok, i'll just use the blocklist then. so i switch to blocklist and remove the site. and it then says the site is on my block list. neither of these things are true. i try to go to mozilla addon site to read more to resolve it. it is not whitelisted so i cannot connect, despite me being in blocklist mode. i know i am not that incompetent here so i am forced to assume either the addon is inherently bad or has some absurdly specific bug that renders it 100% useless. but either way i have no reason to use it

This company sells your private information.

Collects and stores user data.

I can't figure out how to use it.

Collects and sends browsing history

this sucks!!!

Simply not usable! Clicked "add to Firefox", but there is no 'dialogue box' to control this add-on! Hence. by design, it cannot work - and it doesn't. Complete waste of time.

i hate it

When the tab or window of the site I want to block doesn't until I click on said tab/window, then realizes it should be blocking it, it's really not doing it's job.

"Non-Personal Information collected through your use of the browser extension includes:

Browsing history information (URLs/domains visited)" - I think that says everything.

Wiped out tabs, can't return to websites, website addresses are deleted.

I installed this with tabs open in the firefox browser. When I changed to the tabs, the contents would be replaced with an ad for Blocksite. When I hit the back button the contents would be replaced again.

When i disabled Blocksite from Manage Extensions, those all tabs were closed. Looking in history/recently closed tabs, i don't see my tab names, it only says 'blocksite', when I reopen those, the tabs are opened with a blank pages, (with an web address of moz-extension://1a433477-5e82-4f78-b348-a664e3101618/blocked.html) and the back button is grayed out.

Essentially, BlockSite causes me to loose the tabs I had open and deletes the webpage address.

For some reason I cant find the options to control blocksite, add/remove websites, or even see an icon at the top of firefox. The only thing i see is the Enable and Remove buttons in Add-ons (Ctrl+Shift+A). There is no Options button, (like I have for Adblock Pus), so I can't control the add-on or even block spyware data collection.

This is after installing blocksite from https://addons.mozilla.org, adding a problem website address, and then closing the web page that allowed me to add the address to block.

Firefox Quantum 67.0.3 (64-bit) on a Win7 PC.

Doesn't work. Firefox for Android.