Tens of thousands of protesters have rallied in the streets of Tel Aviv and other Israeli cities, promising "days of disruption", as Prime Minister Benjamin Netanyahu's far-right government advanced its plan to overhaul the judiciary.

The rallies on Saturday marked the 28th straight week of demonstrations against Netanyahu's plan and come days after his government gave initial approval to a key bill which is part of the overhaul.

The bill, which was approved in its first reading, would reduce the "reasonability" clause through which the judiciary can strike down government decisions.

It would also give the government a greater say in the appointment of judges.

The bill still needs to be approved in two more votes, expected by the end of the month, before it becomes law.

In Tel Aviv, protesters unrolled a large banner reading "SOS" and threw paint powder into the sky, streaking it pink and orange.

"Handmaids" – women dressed in red robes as characters from the dystopian novel and TV series The Handmaid's Tale – once again took to the streets. Their jarring appearance is meant to drive home the notion that, if the overhaul passes, women could be stripped of their rights.

"This is a battle for the country, we want to keep Israel democratic and the dictatorship laws won't pass here," protester Nili Elezra, 54, told the AFP news agency.