Objections have been raised to a likely deal between the US and the UK that would give London the right to gain access to data held by American tech firms.

Google's Chrome and Microsoft's Edge are the only widely-used browsers which have no inbuilt protection against tracking users, the digital rights body, the Electronic Frontier Foundation, says.

Google has come under pressure from 14 human rights organisations in the US to drop its plan to launch a censored version of its search engine in China.