Thousands of protesters have taken to the streets across Tel Aviv to voice opposition with Israeli prime minister Benjamin Netanyahu for pressing on with his much controversial “justice reform” plan.

The demonstration was held in the coastal city on Saturday evening for the 12th straight week after Netanyahu announced the so-called reforms that he claims seek to improve the balance of power between politicians and the regime's Supreme Court.

The changes are slated to rob the court of the power to overrule decisions made by Israel's new extremist cabinet and the Knesset. They will also enable lawmakers to override the court's rulings with a simple majority, while giving them a bigger say in the selection committee that appoints the judges.

The Knesset is set to vote on the central part of the legal proposals next week, which foresees changing the way judges are appointed.

During the Saturday demonstration, Josh Drill, a spokesman for the Umbrella Movement of protests, said the reforms were about to turn the occupying regime into what he called "a dictatorship."

"Even if they do pass the judicial coup, this protest is not going anywhere," he added.

To appease the protesters, a parliamentary committee has amended the draft law to make it more palatable, but the opposition has ruled out backing any part of the reform package until all legislative steps are halted.

Demonstrators have also announced a "paralysis week," including rallies and protests outside ministers' homes as well as outside the parliament.

Defending the reforms on Thursday, Netanyahu alleged that the changes "do not take control of the court, but balance and diversify it."

He also vowed that his cabinet remained determined to "responsibly advance the ... reform that will restore the proper balance between the authorities."